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#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define MEMERROR fprintf (stderr,"%s %d : Allocation Memory Error\n", __FILE__, __LINE__)
typedef struct
{
unsigned int nl; /* row number */
unsigned int nc; /* columns number */
double ** data;
} Matrix;
Matrix * CreateMatrix(unsigned int nl_,unsigned int nc_,double val)
{
Matrix * m=malloc(sizeof(*m));
if(m==NULL)
{
MEMERROR;
exit(EXIT_FAILURE);
}
if(nl_==0)
if(nc_!=0)
{
fprintf (stderr,"%s %d : Error : nc_ must be equal to 0\n",__FILE__,__LINE__);
exit(EXIT_FAILURE);
}
if(nc_==0)
if(nl_!=0)
{
fprintf (stderr,"%s %d : Error : nl_ must be equal to 0\n",__FILE__,__LINE__);
exit(EXIT_FAILURE);
}
if(nl_==0)
{
m->nl=0;
m->nc=0;
m->data=NULL;
}
else
{
m->nl=nl_;
m->nc=nc_;
m->data=malloc(nl_*sizeof(double *));
if(m->data==NULL)
{
MEMERROR;
exit(EXIT_FAILURE);
}
unsigned int i,j;
for(i=0;i<nl_;i++)
{
m->data[i]=malloc(nc_*sizeof(double));
if(m->data[i]==NULL)
{
MEMERROR;
exit(EXIT_FAILURE);
}
for(j=0;j<nc_;j++) m->data[i][j]=val;
}
}
return m;
}
void DestroyMatrix(Matrix ** m)
{
(*m)->nc=0;
(*m)->nl=0;
unsigned int i;
for(i=0;i<(*m)->nl;i++)
{
if((*m)->data[i]!=NULL)
{
free((*m)->data[i]);
(*m)->data[i]=NULL;
}
}
free((*m)->data); (*m)->data=NULL;
free(*m); *m=NULL;
}
int main()
{
unsigned int i,j,k,r;
const unsigned int n=500;
time_t start,end;
Matrix * m=CreateMatrix(n,n,0.);
for(i=0;i<n;++i)
for(j=0;j<n;++j) m->data[i][j]=i+j;
/* calcul de m*m */
double eltime=0.;
unsigned int N=10;
for(r=0;r<N;++r)
{
time(&start);
double s;
for(i=0;i<n;++i)
{
for(j=0;j<n;++j)
{
s=0.;
for(k=0;k<n;++k) s+=m->data[i][k]*m->data[k][j];
}
}
time(&end);
//printf("%10.10le\n",difftime(end,start));
eltime+=difftime(end,start);
}
printf("eltime = %10.10le\n",eltime/N);
DestroyMatrix(&m);
return EXIT_SUCCESS; |
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