Matrix

A lightweight C library for common matrix operations, including determinant calculation, matrix inversion, transposition, and more.

Files

File	Description
matrixlib.h	Header file — function declarations
matrixlib.c	Library implementation
example01.c	Usage example 1
example02.c	Usage example 2
example03.c	Usage example 3

Getting Started

Compilation

Include matrixlib.c in your build alongside your source file:

gcc your_program.c matrixlib.c -o your_program

Usage

Include the header in your C file:

#include "matrixlib.h"

API Reference

All matrices are represented as double ** (pointer to pointer to double).

Matrix Creation

double **seed(int rows, int columns);

Allocates and initializes a new matrix with the given dimensions.

double **identity_matrix(int size);

Creates a square identity matrix of the given size.

double **reallocMatrix(double **original, int rows, int columns);

Reallocates an existing matrix to new dimensions.

Matrix Operations

double **transpose(double **matrix, int rows, int columns);

Returns the transpose of the given matrix.

double **scalar_multiplication(double **matrix, int rows, int columns, long number);

Multiplies every element of a matrix by a scalar value.

double **sum_matrices(double **matrix1, double **matrix2, int rows, int columns, int type);

Adds or subtracts two matrices of equal dimensions. The type parameter controls the operation (e.g., addition or subtraction).

double **matricial_multiplication(double **matrix1, double **matrix2,
                                  int matrix1_rows, int matrix1_columns,
                                  int matrix2_rows, int matrix2_columns);

Multiplies two matrices. Requires matrix1_columns == matrix2_rows.

Matrix Analysis

double determinant(double **matrix, int size);

Computes the determinant of a square matrix.

double **inverse_matrix(double **matrix, int size);

Returns the inverse of a square matrix. The matrix must be non-singular (i.e., determinant != 0).

Example

#include <stdio.h>
#include "matrixlib.h"

int main() {
    int size = 3;

    // Create a 3x3 identity matrix
    double **m = identity_matrix(size);

    // Compute its determinant (should be 1.0)
    double det = determinant(m, size);
    printf("Determinant: %f\n", det);

    // Get its inverse (should also be the identity)
    double **inv = inverse_matrix(m, size);

    return 0;
}

Requirements

• C compiler (GCC recommended)
• C standard library

License

Do whatever you want with it.