arching3 / cmatrix

The custom library calculating a matrix using C language

cmatrix

A library for calculating vectors and two-dimensional matrices.

C99 Standard.

REFERENCE

variable	etc
typedef struct mat	{int *arr--array, int r--row, int c-columm}

functions	parm	desc
void print	(mat*)	Print content of matrix.
mat *add	(mat*, mat*)	Add two matrix and return matrix pointer.
mat *sub	(mat*, mat*)	Sub two matrix and return matrix pointer.
mat *mul	(mat*, mat*)	Multiply two matrix and return matrix poitner.
mat *mul_s	(double n, mat*)	Scalar product.
mat *mat_init	(int r, int c)	Initialize matrix to zero.
mat *mat_init_f	(char*)	Initialize matrix using data read from file and return matrix pointer.
mat *mat_init_a	(double*arr, int r, int c)	Initialize matrix using given 1d-array, row, columm and return matrix pointer.
mat *mat_init_r	(int r, int c, long int seed)	Initialize matrix using random number that based on gaussian-distribution.
int reshape	(mat *,int r,int c)	Change the form of the matrix according to the given values of r and c. If success return 1, else return 0.
int save	(char *,mat *)	Save matrix to file if success return 1, else return 0.
void resize	(mat *,int r,int c)	Change (force) the form of the matrix according to the given values of r and c.
mat *mat_copy	(mat *src)	Copy matrix src to dst and return dst
void mat_free	(int argc, ...)	Release memory of matrix pointers in ...

FILEFORMAT

In the first line, enter values for rows and columns,

and separate each number with a space to create a matrix.

2 4
3 421 5 2
55 12 3 4

INSTRUCTIONS

FILL ZERO

#include "matrix.h"
int main(){
	mat *matrix = mat_init(3,4);
	print(matrix);

	/*OUTPUT
	0.000,      0.000,      0.000,      0.000,
   	0.000,      0.000,      0.000,      0.000,
    	0.000,      0.000,      0.000,      0.000,
	*/

	mat_free(1,matrix);
}

FROM FILE

/*my_file.txt
  2 4
  3 421 5 2
  55 12 3 4
*/

#include "matrix.h"
int main(){
	mat *matrix = mat_init_f("my_file.txt");
	print(matrix);
	
	/*OUTPUT
	3.000,    421.000,      5.000,      2.000,
    	55.000,     12.000,      3.000,      4.000,
	*/

	mat_free(1,matrix);
}

FROM 1D-ARRAY

#inclue "matrix.h"

double array[] = {2.4, 5.1, 22.2, 3.6, 1.0, 2.0, 4.0, 2.0, 1.0};
int main(){
	mat *matrix = mat_init_a(array,3,3);
	/*!!The number of elements in the array and the r*c value must match!!*/
	print(matrix);
	
	/*OUTPUT
	3.000,      4.000,      2.000,
    	1.000,      2.000,      5.000,
    	2.000,      1.000,      2.000,
	*/

	mat_free(1,matrix);

}

FILL RANDOM NUMBER

#include <time.h> //This required to srand(time(NULL))

#include "matrix.h"
int main(){
	mat *matrix = mat_init_r(4,2,time(NULL));
	print(matrix);

	/*OUTPUT
	1.642,     -1.327,
     	0.738,      0.884,
    	-0.313,      0.324,
    	-0.658,      0.873,
	*/

	mat_free(1,matrix);
}

BUILD

gcc main.c matrix.c -lm

# If u prefer the library than raw build
gcc -fPIC -c matrix.c
gcc -shared -o libmatrix.so matrix.o

#Then

gcc main.c -lmatrix -lm
./a.out

SIMPLE EXAMPLE

#include <stdio.h>
#include <time.h>
#include <matrix.h> //libmatrix.so

int main(){
	mat *m1 = mat_init_r(3,10,time(NULL));
	mat *m2 = mat_init_r(10,7,time(NULL));
	mat *result = mul(m1,m2);
	print(result);
	/*OUTPUT
	-3.672,     -3.639,      1.784,      0.039,      6.257,      3.690,     -2.566,
    	-2.228,      2.148,     -3.768,     -1.955,      0.138,      0.263,     -1.658,
     	2.780,     -2.793,      2.390,      4.821,      1.379,     -5.925,      7.295,
	*/

	mat_free(3,m1,m2,result);
}