#include <stdio.h>
#include <sys/time.h>		/* struct timeval */
#include <sys/resource.h>	/* struct rusage  */

/* returns user time only */
float print_times(struct rusage start, 
		 struct rusage stop,
		 int iterations)
{
  float start_user, stop_user, start_sys, stop_sys, u;

  start_user = start.ru_utime.tv_sec + (start.ru_utime.tv_usec / 1000000.0);
   stop_user =  stop.ru_utime.tv_sec + ( stop.ru_utime.tv_usec / 1000000.0);
  
  start_sys = start.ru_stime.tv_sec + (start.ru_stime.tv_usec / 1000000.0);
   stop_sys =  stop.ru_stime.tv_sec + ( stop.ru_stime.tv_usec / 1000000.0);

   u = (stop_user - start_user) / iterations;

  printf("[user: %f, sys: %f]\n", u,
	                         (stop_sys - start_sys) / iterations);
  return u;
}



void init_vector(float *a, int start, int stop)
{
  int i;

  for(i = start; i < stop; i++)
    a[i] = 0.0;
}

void print_vector(float *a, int start, int stop)
{
  int i;

  for(i = start; i < stop; i++)
    printf("%4.4f ", a[i]);
  printf("\n");
}

void print_array(float a[10][10],
		 int x_start, int x_stop, int y_start, int y_stop)
{
  int i, j;

  for(i = x_start; i < x_stop; i++)
    for(j = y_start; j < y_stop; j++)
      printf("%4.4f ", a[i][j]);
  printf("\n");
}