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#include <u.h>
#include <libc.h>
typedef double Matrix[4][4];
void
mulm(Matrix a, Matrix b)
{
int i, j, k;
Matrix r;
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++){
r[i][j] = 0;
for(k = 0; k < 4; k++)
r[i][j] += a[i][k]*b[k][j];
}
for(i = 0; i < 4; i++)
for(j = 0; j < 4; j++)
a[i][j] = r[i][j];
}
void
printm(Matrix m)
{
int i, j;
for(i = 0; i < 4; i++){
for(j = 0; j < 4; j++)
print("%g\t", m[i][j]);
print("\n");
}
}
void
main()
{
Matrix m1 = {
1, 2, -1, 0,
2, 0, 1, 0,
0, 0, 0, 0,
0, 0, 0, 0
};
Matrix m2 = {
3, 1, 0, 0,
0, -1, 0, 0,
-2, 3, 0, 0,
0, 0, 0, 0
};
mulm(m1, m2);
printm(m1);
exits(0);
}
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