From 6cb1706f55daaea49c41229910e2c629ff137493 Mon Sep 17 00:00:00 2001
From: headlessNode <harriskhan047@outlook.com>
Date: Thu, 9 Apr 2026 23:45:02 +0500
Subject: [PATCH] feat: add blas/ext/base/gwhere

---
 .../@stdlib/blas/ext/base/gwhere/README.md    | 198 +++++
 .../ext/base/gwhere/benchmark/benchmark.js    | 107 +++
 .../gwhere/benchmark/benchmark.ndarray.js     | 107 +++
 .../blas/ext/base/gwhere/docs/repl.txt        | 131 ++++
 .../ext/base/gwhere/docs/types/index.d.ts     | 120 +++
 .../blas/ext/base/gwhere/docs/types/test.ts   | 344 +++++++++
 .../blas/ext/base/gwhere/examples/index.js    |  41 +
 .../blas/ext/base/gwhere/lib/accessors.js     |  99 +++
 .../@stdlib/blas/ext/base/gwhere/lib/index.js |  61 ++
 .../@stdlib/blas/ext/base/gwhere/lib/main.js  |  59 ++
 .../blas/ext/base/gwhere/lib/ndarray.js       |  91 +++
 .../@stdlib/blas/ext/base/gwhere/package.json |  69 ++
 .../@stdlib/blas/ext/base/gwhere/test/test.js |  38 +
 .../blas/ext/base/gwhere/test/test.main.js    | 521 +++++++++++++
 .../blas/ext/base/gwhere/test/test.ndarray.js | 719 ++++++++++++++++++
 15 files changed, 2705 insertions(+)
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/README.md
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/benchmark/benchmark.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/benchmark/benchmark.ndarray.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/repl.txt
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/types/index.d.ts
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/types/test.ts
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/examples/index.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/accessors.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/index.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/main.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/ndarray.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/package.json
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.main.js
 create mode 100644 lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.ndarray.js

diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/README.md b/lib/node_modules/@stdlib/blas/ext/base/gwhere/README.md
new file mode 100644
index 000000000000..15799d2f530f
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/README.md
@@ -0,0 +1,198 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# gwhere
+
+> Take elements from one of two strided arrays depending on a condition.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var gwhere = require( '@stdlib/blas/ext/base/gwhere' );
+```
+
+#### gwhere( N, condition, strideC, x, strideX, y, strideY )
+
+Takes elements from one of two strided arrays depending on a condition.
+
+```javascript
+var condition = [ 1, 0, 1 ];
+var x = [ 1.0, 2.0, 3.0 ];
+var y = [ 4.0, 5.0, 6.0 ];
+
+var out = gwhere( 3, condition, 1, x, 1, y, 1 );
+// returns [ 1.0, 5.0, 3.0 ]
+```
+
+The function has the following parameters:
+
+-   **N**: number of indexed elements.
+-   **condition**: condition array.
+-   **strideC**: stride length for `condition`.
+-   **x**: first input [`Array`][mdn-array] or [`typed array`][mdn-typed-array].
+-   **strideX**: stride length for `x`.
+-   **y**: second input [`Array`][mdn-array] or [`typed array`][mdn-typed-array].
+-   **strideY**: stride length for `y`.
+
+The `N` and stride parameters determine which elements in the strided arrays are accessed at runtime. For example, to select from every other element:
+
+```javascript
+var condition = [ 1, 0, 0, 1, 1, 0 ];
+var x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
+var y = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
+
+var out = gwhere( 3, condition, 2, x, 2, y, 2 );
+// returns [ 1.0, 9.0, 5.0 ]
+```
+
+Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][mdn-typed-array] views.
+
+<!-- eslint-disable stdlib/capitalized-comments, max-len -->
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+// Initial arrays...
+var condition0 = new Float64Array( [ 0.0, 1.0, 0.0, 1.0, 0.0, 1.0 ] );
+var x0 = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+var y0 = new Float64Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
+
+// Create offset views...
+var condition1 = new Float64Array( condition0.buffer, condition0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
+var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
+var y1 = new Float64Array( y0.buffer, y0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
+
+var out = gwhere( 3, condition1, 2, x1, 2, y1, 2 );
+// returns [ 2.0, 4.0, 6.0 ]
+```
+
+<!-- lint disable maximum-heading-length -->
+
+#### gwhere.ndarray( N, condition, strideC, offsetC, x, strideX, offsetX, y, strideY, offsetY )
+
+<!-- lint enable maximum-heading-length -->
+
+Takes elements from one of two strided arrays depending on a condition using alternative indexing semantics.
+
+```javascript
+var condition = [ 1, 0, 1 ];
+var x = [ 1.0, 2.0, 3.0 ];
+var y = [ 4.0, 5.0, 6.0 ];
+
+var out = gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, 0 );
+// returns [ 1.0, 5.0, 3.0 ]
+```
+
+The function has the following additional parameters:
+
+-   **offsetC**: starting index for `condition`.
+-   **offsetX**: starting index for `x`.
+-   **offsetY**: starting index for `y`.
+
+While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying buffer, offset parameters support indexing semantics based on starting indices. For example, to select from every other element starting from the second element:
+
+```javascript
+var condition = [ 0, 1, 0, 0, 0, 1 ];
+var x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
+var y = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
+
+var out = gwhere.ndarray( 3, condition, 2, 1, x, 2, 1, y, 2, 1 );
+// returns [ 2.0, 10.0, 6.0 ]
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   If `N <= 0`, both functions return an empty array.
+-   Both functions support array-like objects having getter and setter accessors for array element access (e.g., [`@stdlib/array/base/accessor`][@stdlib/array/base/accessor]).
+-   Both functions return a new generic `Array`. To assign results to a specific output array, use [`@stdlib/array/base/where`][@stdlib/array/base/where].
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var gwhere = require( '@stdlib/blas/ext/base/gwhere' );
+
+var condition = bernoulli( 20, 0.5, {
+    'dtype': 'generic'
+});
+var x = discreteUniform( 20, 0, 100, {
+    'dtype': 'generic'
+});
+var y = discreteUniform( 20, -100, 0, {
+    'dtype': 'generic'
+});
+console.log( condition );
+console.log( x );
+console.log( y );
+
+var out = gwhere( condition.length, condition, 1, x, 1, y, 1 );
+console.log( out );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[mdn-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
+
+[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
+
+[@stdlib/array/base/accessor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/accessor
+
+[@stdlib/array/base/where]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/where
+
+</section>
+
+<!-- /.links -->
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/benchmark/benchmark.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/benchmark/benchmark.js
new file mode 100644
index 000000000000..4461cc79dddc
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/benchmark/benchmark.js
@@ -0,0 +1,107 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var isArray = require( '@stdlib/assert/is-array' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var gwhere = require( './../lib/main.js' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'generic'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var condition = bernoulli( len, 0.5, options );
+	var x = uniform( len, -100, 100, options );
+	var y = uniform( len, -100, 100, options );
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var out;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			condition[ i%len ] = ( condition[ i%len ] + 1 ) % 2;
+			out = gwhere( len, condition, 1, x, 1, y, 1 );
+			if ( !isArray( out ) ) {
+				b.fail( 'should return an array' );
+			}
+		}
+		b.toc();
+		if ( !isArray( out ) ) {
+			b.fail( 'should return an array' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+		f = createBenchmark( len );
+		bench( format( '%s:len=%d', pkg, len ), f );
+	}
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/benchmark/benchmark.ndarray.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/benchmark/benchmark.ndarray.js
new file mode 100644
index 000000000000..6136d6c767f2
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/benchmark/benchmark.ndarray.js
@@ -0,0 +1,107 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var isArray = require( '@stdlib/assert/is-array' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var gwhere = require( './../lib/ndarray.js' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'generic'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var condition = bernoulli( len, 0.5, options );
+	var x = uniform( len, -100, 100, options );
+	var y = uniform( len, -100, 100, options );
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var out;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			condition[ i%len ] = ( condition[ i%len ] + 1 ) % 2;
+			out = gwhere( len, condition, 1, 0, x, 1, 0, y, 1, 0 );
+			if ( !isArray( out ) ) {
+				b.fail( 'should return an array' );
+			}
+		}
+		b.toc();
+		if ( !isArray( out ) ) {
+			b.fail( 'should return an array' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+		f = createBenchmark( len );
+		bench( format( '%s:ndarray:len=%d', pkg, len ), f );
+	}
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/repl.txt b/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/repl.txt
new file mode 100644
index 000000000000..f7f4fe4e3cb7
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/repl.txt
@@ -0,0 +1,131 @@
+
+{{alias}}( N, condition, strideC, x, strideX, y, strideY )
+    Takes elements from one of two strided arrays depending on a condition.
+
+    The `N` and stride parameters determine which elements in the strided arrays
+    are accessed at runtime.
+
+    Indexing is relative to the first index. To introduce an offset, use a typed
+    array view.
+
+    If `N <= 0`, the function returns an empty array.
+
+    Parameters
+    ----------
+    N: integer
+        Number of indexed elements.
+
+    condition: Array|TypedArray
+        Condition array.
+
+    strideC: integer
+        Stride length for `condition`.
+
+    x: Array|TypedArray
+        First input array.
+
+    strideX: integer
+        Stride length for `x`.
+
+    y: Array|TypedArray
+        Second input array.
+
+    strideY: integer
+        Stride length for `y`.
+
+    Returns
+    -------
+    out: Array
+        Output array.
+
+    Examples
+    --------
+    // Standard Usage:
+    > var condition = [ 1, 0, 1 ];
+    > var x = [ 1.0, 2.0, 3.0 ];
+    > var y = [ 4.0, 5.0, 6.0 ];
+    > var out = {{alias}}( 3, condition, 1, x, 1, y, 1 )
+    [ 1.0, 5.0, 3.0 ]
+
+    // Using `N` and stride parameters:
+    > condition = [ 1, 0, 0, 1, 1, 0 ];
+    > x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
+    > y = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
+    > out = {{alias}}( 3, condition, 2, x, 2, y, 2 )
+    [ 1.0, 9.0, 5.0 ]
+
+    // Using view offsets:
+    > var c0 = new {{alias:@stdlib/array/float64}}( [ 0.0, 1.0, 0.0, 1.0 ] );
+    > var x0 = new {{alias:@stdlib/array/float64}}( [ 1.0, 2.0, 3.0, 4.0 ] );
+    > var y0 = new {{alias:@stdlib/array/float64}}( [ 5.0, 6.0, 7.0, 8.0 ] );
+    > var c1 = new {{alias:@stdlib/array/float64}}( c0.buffer, c0.BYTES_PER_ELEMENT*1 );
+    > var x1 = new {{alias:@stdlib/array/float64}}( x0.buffer, x0.BYTES_PER_ELEMENT*1 );
+    > var y1 = new {{alias:@stdlib/array/float64}}( y0.buffer, y0.BYTES_PER_ELEMENT*1 );
+    > out = {{alias}}( 2, c1, 1, x1, 1, y1, 1 )
+    [ 2.0, 7.0 ]
+
+
+{{alias}}.ndarray( N, c, sc, oc, x, sx, ox, y, sy, oy )
+    Takes elements from one of two strided arrays depending on a condition
+    using alternative indexing semantics.
+
+    While typed array views mandate a view offset based on the underlying
+    buffer, the offset parameters support indexing semantics based on starting
+    indices.
+
+    Parameters
+    ----------
+    N: integer
+        Number of indexed elements.
+
+    c: Array|TypedArray
+        Condition array.
+
+    sc: integer
+        Stride length for `condition`.
+
+    oc: integer
+        Starting index for `condition`.
+
+    x: Array|TypedArray
+        First input array.
+
+    sx: integer
+        Stride length for `x`.
+
+    ox: integer
+        Starting index for `x`.
+
+    y: Array|TypedArray
+        Second input array.
+
+    sy: integer
+        Stride length for `y`.
+
+    oy: integer
+        Starting index for `y`.
+
+    Returns
+    -------
+    out: Array
+        Output array.
+
+    Examples
+    --------
+    // Standard Usage:
+    > var condition = [ 1, 0, 1 ];
+    > var x = [ 1.0, 2.0, 3.0 ];
+    > var y = [ 4.0, 5.0, 6.0 ];
+    > var out = {{alias}}.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, 0 )
+    [ 1.0, 5.0, 3.0 ]
+
+    // Advanced indexing:
+    > condition = [ 0, 1, 0, 0, 0, 1 ];
+    > x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
+    > y = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
+    > out = {{alias}}.ndarray( 3, condition, 2, 1, x, 2, 1, y, 2, 1 )
+    [ 2.0, 10.0, 6.0 ]
+
+    See Also
+    --------
+
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/types/index.d.ts b/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/types/index.d.ts
new file mode 100644
index 000000000000..b18b5f2cbcce
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/types/index.d.ts
@@ -0,0 +1,120 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { Collection, AccessorArrayLike } from '@stdlib/types/array';
+
+/**
+* Input array.
+*/
+type InputArray = Collection | AccessorArrayLike<any>;
+
+/**
+* Output array.
+*/
+type OutputArray = Collection | AccessorArrayLike<any>;
+
+/**
+* Interface describing `gwhere`.
+*/
+interface Routine {
+	/**
+	* Takes elements from one of two strided arrays depending on a condition.
+	*
+	* @param N - number of indexed elements
+	* @param condition - condition array
+	* @param strideC - stride length for `condition`
+	* @param x - first input array
+	* @param strideX - stride length for `x`
+	* @param y - second input array
+	* @param strideY - stride length for `y`
+	* @returns output array
+	*
+	* @example
+	* var condition = [ 1, 0, 1 ];
+	* var x = [ 1.0, 2.0, 3.0 ];
+	* var y = [ 4.0, 5.0, 6.0 ];
+	*
+	* var out = gwhere( 3, condition, 1, x, 1, y, 1 );
+	* // returns [ 1.0, 5.0, 3.0 ]
+	*/
+	( N: number, condition: InputArray, strideC: number, x: InputArray, strideX: number, y: InputArray, strideY: number ): OutputArray;
+
+	/**
+	* Takes elements from one of two strided arrays depending on a condition using alternative indexing semantics.
+	*
+	* @param N - number of indexed elements
+	* @param condition - condition array
+	* @param strideC - stride length for `condition`
+	* @param offsetC - starting index for `condition`
+	* @param x - first input array
+	* @param strideX - stride length for `x`
+	* @param offsetX - starting index for `x`
+	* @param y - second input array
+	* @param strideY - stride length for `y`
+	* @param offsetY - starting index for `y`
+	* @returns output array
+	*
+	* @example
+	* var condition = [ 1, 0, 1 ];
+	* var x = [ 1.0, 2.0, 3.0 ];
+	* var y = [ 4.0, 5.0, 6.0 ];
+	*
+	* var out = gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, 0 );
+	* // returns [ 1.0, 5.0, 3.0 ]
+	*/
+	ndarray( N: number, condition: InputArray, strideC: number, offsetC: number, x: InputArray, strideX: number, offsetX: number, y: InputArray, strideY: number, offsetY: number ): OutputArray;
+}
+
+/**
+* Takes elements from one of two strided arrays depending on a condition.
+*
+* @param N - number of indexed elements
+* @param condition - condition array
+* @param strideC - stride length for `condition`
+* @param x - first input array
+* @param strideX - stride length for `x`
+* @param y - second input array
+* @param strideY - stride length for `y`
+* @returns output array
+*
+* @example
+* var condition = [ 1, 0, 1 ];
+* var x = [ 1.0, 2.0, 3.0 ];
+* var y = [ 4.0, 5.0, 6.0 ];
+*
+* var out = gwhere( 3, condition, 1, x, 1, y, 1 );
+* // returns [ 1.0, 5.0, 3.0 ]
+*
+* @example
+* var condition = [ 1, 0, 1 ];
+* var x = [ 1.0, 2.0, 3.0 ];
+* var y = [ 4.0, 5.0, 6.0 ];
+*
+* var out = gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, 0 );
+* // returns [ 1.0, 5.0, 3.0 ]
+*/
+declare var gwhere: Routine;
+
+
+// EXPORTS //
+
+export = gwhere;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/types/test.ts b/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/types/test.ts
new file mode 100644
index 000000000000..77011b941f1f
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/docs/types/test.ts
@@ -0,0 +1,344 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import AccessorArray = require( '@stdlib/array/base/accessor' );
+import gwhere = require( './index' );
+
+
+// TESTS //
+
+// The function returns an array...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere( 3, condition, 1, x, 1, y, 1 ); // $ExpectType float64Array
+	gwhere( 3, condition, 1, new AccessorArray( x ), 1, new AccessorArray( y ), 1 ); // $ExpectType AccessorArray<number>
+}
+
+// The compiler throws an error if the function is provided a first argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere( '10', condition, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( true, condition, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( false, condition, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( null, condition, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( undefined, condition, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( [], condition, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( {}, condition, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( ( x: number ): number => x, condition, 1, x, 1, y, 1 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a second argument which is not a collection...
+{
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere( 3, 10, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, '10', 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, true, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, false, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, null, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, undefined, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, {}, 1, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, ( x: number ): number => x, 1, x, 1, y, 1 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a third argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere( 3, condition, '10', x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, true, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, false, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, null, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, undefined, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, [], x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, {}, x, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, ( x: number ): number => x, x, 1, y, 1 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a fourth argument which is not a collection...
+{
+	const condition = [ 1, 0, 1 ];
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere( 3, condition, 1, 10, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, '10', 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, true, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, false, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, null, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, undefined, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, {}, 1, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, ( x: number ): number => x, 1, y, 1 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a fifth argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere( 3, condition, 1, x, '10', y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, true, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, false, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, null, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, undefined, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, [], y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, {}, y, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, ( x: number ): number => x, y, 1 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a sixth argument which is not a collection...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+
+	gwhere( 3, condition, 1, x, 1, 10, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, '10', 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, true, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, false, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, null, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, undefined, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, {}, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, ( x: number ): number => x, 1 ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided a seventh argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere( 3, condition, 1, x, 1, y, '10' ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y, true ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y, false ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y, null ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y, undefined ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y, [] ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y, {} ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y, ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere(); // $ExpectError
+	gwhere( 3 ); // $ExpectError
+	gwhere( 3, condition ); // $ExpectError
+	gwhere( 3, condition, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1 ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y ); // $ExpectError
+	gwhere( 3, condition, 1, x, 1, y, 1, 10 ); // $ExpectError
+}
+
+// Attached to main export is an `ndarray` method which returns an array...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectType float64Array
+	gwhere.ndarray( 3, condition, 1, 0, new AccessorArray( x ), 1, 0, new AccessorArray( y ), 1, 0 ); // $ExpectType AccessorArray<number>
+}
+
+// The compiler throws an error if the `ndarray` method is provided a first argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( '10', condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( true, condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( false, condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( null, condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( undefined, condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( [], condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( {}, condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( ( x: number ): number => x, condition, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided a second argument which is not a collection...
+{
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, 10, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, '10', 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, true, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, false, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, null, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, undefined, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, {}, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, ( x: number ): number => x, 1, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided a third argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, condition, '10', 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, true, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, false, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, null, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, undefined, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, [], 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, {}, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, ( x: number ): number => x, 0, x, 1, 0, y, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided a fourth argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, condition, 1, '10', x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, true, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, false, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, null, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, undefined, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, [], x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, {}, x, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, ( x: number ): number => x, x, 1, 0, y, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided a fifth argument which is not a collection...
+{
+	const condition = [ 1, 0, 1 ];
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, condition, 1, 0, 10, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, '10', 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, true, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, false, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, null, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, undefined, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, {}, 1, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, ( x: number ): number => x, 1, 0, y, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided a sixth argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, condition, 1, 0, x, '10', 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, true, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, false, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, null, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, undefined, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, [], 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, {}, 0, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, ( x: number ): number => x, 0, y, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided a seventh argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, '10', y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, true, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, false, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, null, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, undefined, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, [], y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, {}, y, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, ( x: number ): number => x, y, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided an eighth argument which is not a collection...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, 10, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, '10', 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, true, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, false, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, null, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, undefined, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, {}, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, ( x: number ): number => x, 1, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided a ninth argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, '10', 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, true, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, false, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, null, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, undefined, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, [], 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, {}, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, ( x: number ): number => x, 0 ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided a tenth argument which is not a number...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, '10' ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, true ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, false ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, null ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, undefined ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, [] ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, {} ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the `ndarray` method is provided an unsupported number of arguments...
+{
+	const condition = [ 1, 0, 1 ];
+	const x = new Float64Array( [ 1.0, 2.0, 3.0 ] );
+	const y = new Float64Array( [ 4.0, 5.0, 6.0 ] );
+
+	gwhere.ndarray(); // $ExpectError
+	gwhere.ndarray( 3 ); // $ExpectError
+	gwhere.ndarray( 3, condition ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1 ); // $ExpectError
+	gwhere.ndarray( 3, condition, 1, 0, x, 1, 0, y, 1, 0, 10 ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/examples/index.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/examples/index.js
new file mode 100644
index 000000000000..6be7d6efab76
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/examples/index.js
@@ -0,0 +1,41 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var gwhere = require( './../lib' );
+
+var condition = bernoulli( 20, 0.5, {
+	'dtype': 'generic'
+});
+console.log( condition );
+
+var x = discreteUniform( 20, 0, 100, {
+	'dtype': 'generic'
+});
+console.log( x );
+
+var y = discreteUniform( 20, -100, 0, {
+	'dtype': 'generic'
+});
+console.log( y );
+
+var out = gwhere( condition.length, condition, 1, x, 1, y, 1 );
+console.log( out );
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/accessors.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/accessors.js
new file mode 100644
index 000000000000..0245ad58bf95
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/accessors.js
@@ -0,0 +1,99 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MAIN //
+
+/**
+* Takes elements from one of two strided arrays depending on a condition.
+*
+* @private
+* @param {PositiveInteger} N - number of indexed elements
+* @param {Object} condition - condition array object
+* @param {Collection} condition.data - condition array data
+* @param {Array<Function>} condition.accessors - array element accessors
+* @param {integer} strideC - stride length for `condition`
+* @param {NonNegativeInteger} offsetC - starting index for `condition`
+* @param {Object} x - first input array object
+* @param {Collection} x.data - first input array data
+* @param {Array<Function>} x.accessors - array element accessors
+* @param {integer} strideX - stride length for `x`
+* @param {NonNegativeInteger} offsetX - starting index for `x`
+* @param {Object} y - second input array object
+* @param {Collection} y.data - second input array data
+* @param {Array<Function>} y.accessors - array element accessors
+* @param {integer} strideY - stride length for `y`
+* @param {NonNegativeInteger} offsetY - starting index for `y`
+* @param {Array} out - output array
+* @returns {Array} output array
+*
+* @example
+* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
+* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
+*
+* var condition = [ 1, 0, 1 ];
+* var x = [ 1.0, 2.0, 3.0 ];
+* var y = [ 4.0, 5.0, 6.0 ];
+* var out = [ 0.0, 0.0, 0.0 ];
+*
+* gwhere( 3, arraylike2object( toAccessorArray( condition ) ), 1, 0, arraylike2object( toAccessorArray( x ) ), 1, 0, arraylike2object( toAccessorArray( y ) ), 1, 0, out );
+* // out => [ 1.0, 5.0, 3.0 ]
+*/
+function gwhere( N, condition, strideC, offsetC, x, strideX, offsetX, y, strideY, offsetY, out ) { // eslint-disable-line max-len, max-params
+	var cbuf;
+	var xbuf;
+	var ybuf;
+	var cget;
+	var xget;
+	var yget;
+	var ic;
+	var ix;
+	var iy;
+	var i;
+
+	// Cache references to array data:
+	cbuf = condition.data;
+	xbuf = x.data;
+	ybuf = y.data;
+
+	// Cache references to element accessors:
+	cget = condition.accessors[ 0 ];
+	xget = x.accessors[ 0 ];
+	yget = y.accessors[ 0 ];
+
+	ic = offsetC;
+	ix = offsetX;
+	iy = offsetY;
+	for ( i = 0; i < N; i++ ) {
+		if ( cget( cbuf, ic ) ) {
+			out[ i ] = xget( xbuf, ix );
+		} else {
+			out[ i ] = yget( ybuf, iy );
+		}
+		ic += strideC;
+		ix += strideX;
+		iy += strideY;
+	}
+	return out;
+}
+
+
+// EXPORTS //
+
+module.exports = gwhere;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/index.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/index.js
new file mode 100644
index 000000000000..c11d13b2a7a3
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/index.js
@@ -0,0 +1,61 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Take elements from one of two strided arrays depending on a condition.
+*
+* @module @stdlib/blas/ext/base/gwhere
+*
+* @example
+* var gwhere = require( '@stdlib/blas/ext/base/gwhere' );
+*
+* var condition = [ 1, 0, 1 ];
+* var x = [ 1.0, 2.0, 3.0 ];
+* var y = [ 4.0, 5.0, 6.0 ];
+*
+* var out = gwhere( 3, condition, 1, x, 1, y, 1 );
+* // returns [ 1.0, 5.0, 3.0 ]
+*
+* @example
+* var gwhere = require( '@stdlib/blas/ext/base/gwhere' );
+*
+* var condition = [ 1, 0, 1, 0 ];
+* var x = [ 1.0, 2.0, 3.0, 4.0 ];
+* var y = [ 5.0, 6.0, 7.0, 8.0 ];
+*
+* var out = gwhere.ndarray( 4, condition, 1, 0, x, 1, 0, y, 1, 0 );
+* // returns [ 1.0, 6.0, 3.0, 8.0 ]
+*/
+
+// MODULES //
+
+var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
+var main = require( './main.js' );
+var ndarray = require( './ndarray.js' );
+
+
+// MAIN //
+
+setReadOnly( main, 'ndarray', ndarray );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/main.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/main.js
new file mode 100644
index 000000000000..8dc9e9bd282f
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/main.js
@@ -0,0 +1,59 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var stride2offset = require( '@stdlib/strided/base/stride2offset' );
+var ndarray = require( './ndarray.js' );
+
+
+// MAIN //
+
+/**
+* Takes elements from one of two strided arrays depending on a condition.
+*
+* @param {PositiveInteger} N - number of indexed elements
+* @param {Collection} condition - condition array
+* @param {integer} strideC - stride length for `condition`
+* @param {Collection} x - first input array
+* @param {integer} strideX - stride length for `x`
+* @param {Collection} y - second input array
+* @param {integer} strideY - stride length for `y`
+* @returns {Array} output array
+*
+* @example
+* var x = [ 1.0, 2.0, 3.0 ];
+* var y = [ 4.0, 5.0, 6.0 ];
+* var condition = [ 1, 0, 1 ];
+*
+* var out = gwhere( 3, condition, 1, x, 1, y, 1 );
+* // returns [ 1.0, 5.0, 3.0 ]
+*/
+function gwhere( N, condition, strideC, x, strideX, y, strideY ) {
+	var oc = stride2offset( N, strideC );
+	var ox = stride2offset( N, strideX );
+	var oy = stride2offset( N, strideY );
+	return ndarray( N, condition, strideC, oc, x, strideX, ox, y, strideY, oy );
+}
+
+
+// EXPORTS //
+
+module.exports = gwhere;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/ndarray.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/ndarray.js
new file mode 100644
index 000000000000..26fcbc7a0141
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/lib/ndarray.js
@@ -0,0 +1,91 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
+var accessors = require( './accessors.js' );
+
+
+// MAIN //
+
+/**
+* Takes elements from one of two strided arrays depending on a condition.
+*
+* @param {PositiveInteger} N - number of indexed elements
+* @param {Collection} condition - condition array
+* @param {integer} strideC - stride length for `condition`
+* @param {NonNegativeInteger} offsetC - starting index for `condition`
+* @param {Collection} x - first input array
+* @param {integer} strideX - stride length for `x`
+* @param {NonNegativeInteger} offsetX - starting index for `x`
+* @param {Collection} y - second input array
+* @param {integer} strideY - stride length for `y`
+* @param {NonNegativeInteger} offsetY - starting index for `y`
+* @returns {Array} output array
+*
+* @example
+* var x = [ 1.0, 2.0, 3.0 ];
+* var y = [ 4.0, 5.0, 6.0 ];
+* var condition = [ 1, 0, 1 ];
+*
+* var out = gwhere( 3, condition, 1, 0, x, 1, 0, y, 1, 0 );
+* // returns [ 1.0, 5.0, 3.0 ]
+*/
+function gwhere( N, condition, strideC, offsetC, x, strideX, offsetX, y, strideY, offsetY ) { // eslint-disable-line max-len
+	var out;
+	var oc;
+	var ox;
+	var oy;
+	var ic;
+	var ix;
+	var iy;
+	var i;
+
+	out = [];
+	if ( N <= 0 ) {
+		return out;
+	}
+	oc = arraylike2object( condition );
+	ox = arraylike2object( x );
+	oy = arraylike2object( y );
+	if ( oc.accessorProtocol || ox.accessorProtocol || oy.accessorProtocol ) {
+		return accessors( N, oc, strideC, offsetC, ox, strideX, offsetX, oy, strideY, offsetY, out ); // eslint-disable-line max-len
+	}
+	ic = offsetC;
+	ix = offsetX;
+	iy = offsetY;
+	for ( i = 0; i < N; i++ ) {
+		if ( condition[ ic ] ) {
+			out.push( x[ ix ] );
+		} else {
+			out.push( y[ iy ] );
+		}
+		ic += strideC;
+		ix += strideX;
+		iy += strideY;
+	}
+	return out;
+}
+
+
+// EXPORTS //
+
+module.exports = gwhere;
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/package.json b/lib/node_modules/@stdlib/blas/ext/base/gwhere/package.json
new file mode 100644
index 000000000000..a1cfbf2011ee
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/package.json
@@ -0,0 +1,69 @@
+{
+  "name": "@stdlib/blas/ext/base/gwhere",
+  "version": "0.0.0",
+  "description": "Take elements from one of two strided arrays depending on a condition.",
+  "license": "Apache-2.0",
+  "author": {
+    "name": "The Stdlib Authors",
+    "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+  },
+  "contributors": [
+    {
+      "name": "The Stdlib Authors",
+      "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+    }
+  ],
+  "main": "./lib",
+  "directories": {
+    "benchmark": "./benchmark",
+    "doc": "./docs",
+    "example": "./examples",
+    "lib": "./lib",
+    "test": "./test"
+  },
+  "types": "./docs/types",
+  "scripts": {},
+  "homepage": "https://github.com/stdlib-js/stdlib",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/stdlib-js/stdlib.git"
+  },
+  "bugs": {
+    "url": "https://github.com/stdlib-js/stdlib/issues"
+  },
+  "dependencies": {},
+  "devDependencies": {},
+  "engines": {
+    "node": ">=0.10.0",
+    "npm": ">2.7.0"
+  },
+  "os": [
+    "aix",
+    "darwin",
+    "freebsd",
+    "linux",
+    "macos",
+    "openbsd",
+    "sunos",
+    "win32",
+    "windows"
+  ],
+  "keywords": [
+    "stdlib",
+    "stdmath",
+    "mathematics",
+    "math",
+    "blas",
+    "extended",
+    "where",
+    "condition",
+    "conditional",
+    "select",
+    "ternary",
+    "strided",
+    "strided array",
+    "typed",
+    "array"
+  ],
+  "__stdlib__": {}
+}
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.js
new file mode 100644
index 000000000000..0419572eec7d
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.js
@@ -0,0 +1,38 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var gwhere = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof gwhere, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'attached to the main export is a method providing an ndarray interface', function test( t ) {
+	t.strictEqual( typeof gwhere.ndarray, 'function', 'method is a function' );
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.main.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.main.js
new file mode 100644
index 000000000000..4255f0ffaa4d
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.main.js
@@ -0,0 +1,521 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
+var Float64Array = require( '@stdlib/array/float64' );
+var gwhere = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof gwhere, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function has an arity of 7', function test( t ) {
+	t.strictEqual( gwhere.length, 7, 'has expected arity' );
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 0, 1, 0, 1 ];
+	x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
+	y = [ 6.0, 7.0, 8.0, 9.0, 10.0 ];
+
+	out = gwhere( 5, condition, 1, x, 1, y, 1 );
+	expected = [ 1.0, 7.0, 3.0, 9.0, 5.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition (all true)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 1, 1 ];
+	x = [ 1.0, 2.0, 3.0 ];
+	y = [ 4.0, 5.0, 6.0 ];
+
+	out = gwhere( 3, condition, 1, x, 1, y, 1 );
+	expected = [ 1.0, 2.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition (all false)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 0, 0, 0 ];
+	x = [ 1.0, 2.0, 3.0 ];
+	y = [ 4.0, 5.0, 6.0 ];
+
+	out = gwhere( 3, condition, 1, x, 1, y, 1 );
+	expected = [ 4.0, 5.0, 6.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition (truthy/falsy)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ true, false, 'a', '', 5, 0, null ];
+	x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 ];
+	y = [ 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0 ];
+
+	out = gwhere( 7, condition, 1, x, 1, y, 1 );
+	expected = [ 1.0, 9.0, 3.0, 11.0, 5.0, 13.0, 14.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 0, 1, 0, 1 ];
+	x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
+	y = [ 6.0, 7.0, 8.0, 9.0, 10.0 ];
+
+	out = gwhere( 5, toAccessorArray( condition ), 1, toAccessorArray( x ), 1, toAccessorArray( y ), 1 );
+	expected = [ 1.0, 7.0, 3.0, 9.0, 5.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function returns a new array', function test( t ) {
+	var condition;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 0, 1 ];
+	x = [ 1.0, 2.0, 3.0 ];
+	y = [ 4.0, 5.0, 6.0 ];
+
+	out = gwhere( 3, condition, 1, x, 1, y, 1 );
+
+	t.notEqual( out, x, 'returns a new array' );
+	t.notEqual( out, y, 'returns a new array' );
+	t.strictEqual( out instanceof Array, true, 'returns an Array' );
+	t.end();
+});
+
+tape( 'if provided an `N` parameter less than or equal to `0`, the function returns an empty array', function test( t ) {
+	var condition;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 0, 1 ];
+	x = [ 1.0, 2.0, 3.0 ];
+	y = [ 4.0, 5.0, 6.0 ];
+
+	out = gwhere( -1, condition, 1, x, 1, y, 1 );
+	t.deepEqual( out, [], 'returns expected value' );
+
+	out = gwhere( 0, condition, 1, x, 1, y, 1 );
+	t.deepEqual( out, [], 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `condition` stride', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0,
+		0, // 1
+		1,
+		1  // 2
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 0
+		7.0, // 1
+		8.0, // 2
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, condition, 2, x, 1, y, 1 );
+	expected = [ 1.0, 7.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `condition` stride (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0,
+		0, // 1
+		1,
+		1  // 2
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 0
+		7.0, // 1
+		8.0, // 2
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 2, toAccessorArray( x ), 1, toAccessorArray( y ), 1 );
+	expected = [ 1.0, 7.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports an `x` stride', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0, // 1
+		1, // 2
+		0,
+		0
+	];
+	x = [
+		1.0, // 0
+		2.0,
+		3.0, // 1
+		4.0,
+		5.0  // 2
+	];
+	y = [
+		6.0, // 0
+		7.0, // 1
+		8.0, // 2
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, condition, 1, x, 2, y, 1 );
+	expected = [ 1.0, 7.0, 5.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports an `x` stride (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0, // 1
+		1, // 2
+		0,
+		0
+	];
+	x = [
+		1.0, // 0
+		2.0,
+		3.0, // 1
+		4.0,
+		5.0  // 2
+	];
+	y = [
+		6.0, // 0
+		7.0, // 1
+		8.0, // 2
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 1, toAccessorArray( x ), 2, toAccessorArray( y ), 1 );
+	expected = [ 1.0, 7.0, 5.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `y` stride', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		0, // 0
+		1, // 1
+		0, // 2
+		1,
+		0
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 0
+		7.0,
+		8.0, // 1
+		9.0,
+		10.0 // 2
+	];
+
+	out = gwhere( 3, condition, 1, x, 1, y, 2 );
+	expected = [ 6.0, 2.0, 10.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `y` stride (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		0, // 0
+		1, // 1
+		0, // 2
+		1,
+		0
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 0
+		7.0,
+		8.0, // 1
+		9.0,
+		10.0 // 2
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 1, toAccessorArray( x ), 1, toAccessorArray( y ), 2 );
+	expected = [ 6.0, 2.0, 10.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports negative strides', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 2
+		0,
+		0, // 1
+		1,
+		1  // 0
+	];
+	x = [
+		1.0, // 2
+		2.0, // 1
+		3.0, // 0
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 2
+		7.0, // 1
+		8.0, // 0
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, condition, -2, x, -1, y, -1 );
+	expected = [ 3.0, 7.0, 1.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports negative strides (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 2
+		0,
+		0, // 1
+		1,
+		1  // 0
+	];
+	x = [
+		1.0, // 2
+		2.0, // 1
+		3.0, // 0
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 2
+		7.0, // 1
+		8.0, // 0
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), -2, toAccessorArray( x ), -1, toAccessorArray( y ), -1 );
+	expected = [ 3.0, 7.0, 1.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports complex access patterns', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0,
+		0, // 1
+		1,
+		1, // 2
+		0
+	];
+	x = [
+		1.0,  // 2
+		2.0,  // 1
+		3.0,  // 0
+		4.0,
+		5.0,
+		6.0
+	];
+	y = [
+		7.0, // 0
+		8.0,
+		9.0, // 1
+		10.0,
+		11.0, // 2
+		12.0
+	];
+
+	out = gwhere( 3, condition, 2, x, -1, y, 2 );
+	expected = [ 3.0, 9.0, 1.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports view offsets', function test( t ) {
+	var condition0;
+	var condition1;
+	var expected;
+	var out;
+	var x0;
+	var y0;
+	var x1;
+	var y1;
+
+	// Initial arrays...
+	condition0 = new Float64Array( [ 0.0, 1.0, 0.0, 1.0, 0.0, 1.0 ] );
+	x0 = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
+	y0 = new Float64Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
+
+	// Create offset views...
+	condition1 = new Float64Array( condition0.buffer, condition0.BYTES_PER_ELEMENT*1 ); // begin at 2nd element
+	x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // begin at 2nd element
+	y1 = new Float64Array( y0.buffer, y0.BYTES_PER_ELEMENT*1 ); // begin at 2nd element
+
+	out = gwhere( 3, condition1, 2, x1, 2, y1, 2 );
+	expected = [ 2.0, 4.0, 6.0 ];
+
+	t.deepEqual( out, expected, 'returns expected value' );
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.ndarray.js b/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.ndarray.js
new file mode 100644
index 000000000000..ff99217d41d3
--- /dev/null
+++ b/lib/node_modules/@stdlib/blas/ext/base/gwhere/test/test.ndarray.js
@@ -0,0 +1,719 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
+var gwhere = require( './../lib/ndarray.js' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof gwhere, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function has an arity of 10', function test( t ) {
+	t.strictEqual( gwhere.length, 10, 'has expected arity' );
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 0, 1, 0, 1 ];
+	x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
+	y = [ 6.0, 7.0, 8.0, 9.0, 10.0 ];
+
+	out = gwhere( 5, condition, 1, 0, x, 1, 0, y, 1, 0 );
+	expected = [ 1.0, 7.0, 3.0, 9.0, 5.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition (all true)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 1, 1 ];
+	x = [ 1.0, 2.0, 3.0 ];
+	y = [ 4.0, 5.0, 6.0 ];
+
+	out = gwhere( 3, condition, 1, 0, x, 1, 0, y, 1, 0 );
+	expected = [ 1.0, 2.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition (all false)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 0, 0, 0 ];
+	x = [ 1.0, 2.0, 3.0 ];
+	y = [ 4.0, 5.0, 6.0 ];
+
+	out = gwhere( 3, condition, 1, 0, x, 1, 0, y, 1, 0 );
+	expected = [ 4.0, 5.0, 6.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition (truthy/falsy)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ true, false, 'a', '', 5, 0, null ];
+	x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 ];
+	y = [ 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0 ];
+
+	out = gwhere( 7, condition, 1, 0, x, 1, 0, y, 1, 0 );
+	expected = [ 1.0, 9.0, 3.0, 11.0, 5.0, 13.0, 14.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function selects elements from `x` or `y` based on a condition (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 0, 1, 0, 1 ];
+	x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
+	y = [ 6.0, 7.0, 8.0, 9.0, 10.0 ];
+
+	out = gwhere( 5, toAccessorArray( condition ), 1, 0, toAccessorArray( x ), 1, 0, toAccessorArray( y ), 1, 0 );
+	expected = [ 1.0, 7.0, 3.0, 9.0, 5.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function returns a new array', function test( t ) {
+	var condition;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 0, 1 ];
+	x = [ 1.0, 2.0, 3.0 ];
+	y = [ 4.0, 5.0, 6.0 ];
+
+	out = gwhere( 3, condition, 1, 0, x, 1, 0, y, 1, 0 );
+
+	t.notEqual( out, x, 'returns a new array' );
+	t.notEqual( out, y, 'returns a new array' );
+	t.strictEqual( out instanceof Array, true, 'returns an Array' );
+	t.end();
+});
+
+tape( 'if provided an `N` parameter less than or equal to `0`, the function returns an empty array', function test( t ) {
+	var condition;
+	var out;
+	var x;
+	var y;
+
+	condition = [ 1, 0, 1 ];
+	x = [ 1.0, 2.0, 3.0 ];
+	y = [ 4.0, 5.0, 6.0 ];
+
+	out = gwhere( -1, condition, 1, 0, x, 1, 0, y, 1, 0 );
+	t.deepEqual( out, [], 'returns expected value' );
+
+	out = gwhere( 0, condition, 1, 0, x, 1, 0, y, 1, 0 );
+	t.deepEqual( out, [], 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `condition` stride', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0,
+		0, // 1
+		1,
+		1  // 2
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 0
+		7.0, // 1
+		8.0, // 2
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, condition, 2, 0, x, 1, 0, y, 1, 0 );
+	expected = [ 1.0, 7.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `condition` stride (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0,
+		0, // 1
+		1,
+		1  // 2
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 0
+		7.0, // 1
+		8.0, // 2
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 2, 0, toAccessorArray( x ), 1, 0, toAccessorArray( y ), 1, 0 );
+	expected = [ 1.0, 7.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports an `x` stride', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0, // 1
+		1, // 2
+		0,
+		0
+	];
+	x = [
+		1.0, // 0
+		2.0,
+		3.0, // 1
+		4.0,
+		5.0  // 2
+	];
+	y = [
+		6.0, // 0
+		7.0, // 1
+		8.0, // 2
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, condition, 1, 0, x, 2, 0, y, 1, 0 );
+	expected = [ 1.0, 7.0, 5.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports an `x` stride (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0, // 1
+		1, // 2
+		0,
+		0
+	];
+	x = [
+		1.0, // 0
+		2.0,
+		3.0, // 1
+		4.0,
+		5.0  // 2
+	];
+	y = [
+		6.0, // 0
+		7.0, // 1
+		8.0, // 2
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 1, 0, toAccessorArray( x ), 2, 0, toAccessorArray( y ), 1, 0 );
+	expected = [ 1.0, 7.0, 5.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `y` stride', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		0, // 0
+		1, // 1
+		0, // 2
+		1,
+		0
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 0
+		7.0,
+		8.0, // 1
+		9.0,
+		10.0 // 2
+	];
+
+	out = gwhere( 3, condition, 1, 0, x, 1, 0, y, 2, 0 );
+	expected = [ 6.0, 2.0, 10.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `y` stride (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		0, // 0
+		1, // 1
+		0, // 2
+		1,
+		0
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 0
+		7.0,
+		8.0, // 1
+		9.0,
+		10.0 // 2
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 1, 0, toAccessorArray( x ), 1, 0, toAccessorArray( y ), 2, 0 );
+	expected = [ 6.0, 2.0, 10.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports negative strides', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 2
+		0,
+		0, // 1
+		1,
+		1  // 0
+	];
+	x = [
+		1.0, // 2
+		2.0, // 1
+		3.0, // 0
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 2
+		7.0, // 1
+		8.0, // 0
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, condition, -2, 4, x, -1, 2, y, -1, 2 );
+	expected = [ 3.0, 7.0, 1.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports negative strides (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 2
+		0,
+		0, // 1
+		1,
+		1  // 0
+	];
+	x = [
+		1.0, // 2
+		2.0, // 1
+		3.0, // 0
+		4.0,
+		5.0
+	];
+	y = [
+		6.0, // 2
+		7.0, // 1
+		8.0, // 0
+		9.0,
+		10.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), -2, 4, toAccessorArray( x ), -1, 2, toAccessorArray( y ), -1, 2 );
+	expected = [ 3.0, 7.0, 1.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `condition` offset', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		0,
+		1,  // 0
+		0,
+		0,  // 1
+		0,
+		1   // 2
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0,
+		6.0
+	];
+	y = [
+		7.0, // 0
+		8.0, // 1
+		9.0, // 2
+		10.0,
+		11.0,
+		12.0
+	];
+
+	out = gwhere( 3, condition, 2, 1, x, 1, 0, y, 1, 0 );
+	expected = [ 1.0, 8.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `condition` offset (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		0,
+		1,  // 0
+		0,
+		0,  // 1
+		0,
+		1   // 2
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0,
+		5.0,
+		6.0
+	];
+	y = [
+		7.0, // 0
+		8.0, // 1
+		9.0, // 2
+		10.0,
+		11.0,
+		12.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 2, 1, toAccessorArray( x ), 1, 0, toAccessorArray( y ), 1, 0 );
+	expected = [ 1.0, 8.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports an `x` offset', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0, // 1
+		1, // 2
+		0
+	];
+	x = [
+		0.0,
+		1.0,  // 0
+		0.0,
+		2.0,  // 1
+		0.0,
+		3.0,  // 2
+		0.0,
+		4.0
+	];
+	y = [
+		5.0, // 0
+		6.0, // 1
+		7.0, // 2
+		8.0
+	];
+
+	out = gwhere( 3, condition, 1, 0, x, 2, 1, y, 1, 0 );
+	expected = [ 1.0, 6.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports an `x` offset (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0, // 1
+		1, // 2
+		0
+	];
+	x = [
+		0.0,
+		1.0,  // 0
+		0.0,
+		2.0,  // 1
+		0.0,
+		3.0,  // 2
+		0.0,
+		4.0
+	];
+	y = [
+		5.0, // 0
+		6.0, // 1
+		7.0, // 2
+		8.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 1, 0, toAccessorArray( x ), 2, 1, toAccessorArray( y ), 1, 0 );
+	expected = [ 1.0, 6.0, 3.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `y` offset', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		0, // 0
+		1, // 1
+		0, // 2
+		1
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0
+	];
+	y = [
+		0.0,
+		5.0, // 0
+		0.0,
+		6.0, // 1
+		0.0,
+		7.0, // 2
+		0.0,
+		8.0
+	];
+
+	out = gwhere( 3, condition, 1, 0, x, 1, 0, y, 2, 1 );
+	expected = [ 5.0, 2.0, 7.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports a `y` offset (accessors)', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		0, // 0
+		1, // 1
+		0, // 2
+		1
+	];
+	x = [
+		1.0, // 0
+		2.0, // 1
+		3.0, // 2
+		4.0
+	];
+	y = [
+		0.0,
+		5.0, // 0
+		0.0,
+		6.0, // 1
+		0.0,
+		7.0, // 2
+		0.0,
+		8.0
+	];
+
+	out = gwhere( 3, toAccessorArray( condition ), 1, 0, toAccessorArray( x ), 1, 0, toAccessorArray( y ), 2, 1 );
+	expected = [ 5.0, 2.0, 7.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});
+
+tape( 'the function supports complex access patterns', function test( t ) {
+	var condition;
+	var expected;
+	var out;
+	var x;
+	var y;
+
+	condition = [
+		1, // 0
+		0,
+		0, // 1
+		1,
+		1, // 2
+		0
+	];
+	x = [
+		1.0,  // 2
+		2.0,  // 1
+		3.0,  // 0
+		4.0,
+		5.0,
+		6.0
+	];
+	y = [
+		7.0, // 0
+		8.0,
+		9.0, // 1
+		10.0,
+		11.0, // 2
+		12.0
+	];
+
+	out = gwhere( 3, condition, 2, 0, x, -1, 2, y, 2, 0 );
+	expected = [ 3.0, 9.0, 1.0 ];
+	t.deepEqual( out, expected, 'returns expected value' );
+
+	t.end();
+});