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/* FILE : matrix.c : some simple 4x4 matrix operations */
#include <stdlib.h>
#include <stdio.h>
double **new_matrix() {
int i;
double **M;
M = (double **) malloc(4*sizeof(double *));
M[0] = (double *) malloc(16*sizeof(double));
for (i = 0; i < 4; i++) {
M[i] = M[0] + 4*i;
}
return M;
}
void destroy_matrix(double **M) {
free(M[0]);
free(M);
}
void print_matrix(double **M) {
int i,j;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
printf("%10g ", M[i][j]);
}
printf("\n");
}
}
void mat_mult(double **m1, double **m2, double **m3) {
int i,j,k;
double temp[4][4];
for (i = 0; i < 4; i++)
for (j = 0; j < 4; j++) {
temp[i][j] = 0;
for (k = 0; k < 4; k++)
temp[i][j] += m1[i][k]*m2[k][j];
}
for (i = 0; i < 4; i++)
for (j = 0; j < 4; j++)
m3[i][j] = temp[i][j];
}
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