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

#include "mex.h"

/* to compile this file for use in matlab, type
   mex mex_speedTest.c
   mex is the c compiler used by matlab
   it typically calls gcc, after including the appropriate
   libraries.

   If you are using athena, don't forget to "add matlab" first
*/

void
mexFunction( int nlhs, mxArray *plhs[],
             int nrhs, const mxArray *prhs[] )
{

  double x;
  unsigned seed;

  mxArray *mxA;
  double *prIn;
  double *prOut;

  int its;
  
  prIn = mxGetPr(prhs[0]);

  its = (int) prIn[0];

  double sum;
  sum = 0;

  int i;
  for (i = 0; i < its; i++){
    sum += rand()/(RAND_MAX+1.0);
  }


  plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
  prOut = mxGetPr(plhs[0]);
  prOut[0] = sum;
  
}