#include <stdio.h>
#include <stdlib.h>

#define NRA 620                 /* number of rows in matrix A */
#define NCA 750                 /* number of columns in matrix A */
#define NCB 700                  /* number of columns in matrix B */

int main (int argc, char *argv[]) 
{
int     i, j, k, chunk;
double  a[NRA][NCA],           /* matrix A to be multiplied */
        b[NCA][NCB],           /* matrix B to be multiplied */
        c[NRA][NCB];           /* result matrix C */


  /*** Initialize matrices ***/
  for (i=0; i<NRA; i++)
    for (j=0; j<NCA; j++)
      a[i][j]= i+j;
  for (i=0; i<NCA; i++)
    for (j=0; j<NCB; j++)
      b[i][j]= i*j;
  for (i=0; i<NRA; i++)
    for (j=0; j<NCB; j++)
      c[i][j]= 0;

  for (i=0; i<NRA; i++)    
    {
    for(j=0; j<NCB; j++)       
      for (k=0; k<NCA; k++)
        c[i][j] += a[i][k] * b[k][j];
    }

}