Computational routine
eng
mat_det
# include "scicos_block4.h"
# include "../machine.h"
#include <stdio.h>
#if WIN32
#define NULL 0
#endif
extern int C2F(dgetrf)();
typedef struct
{ int *ipiv;
double *wrk;
} mat_det_struct ;
void mat_det(scicos_block *block,int flag)
{
double *u;
double *y;
int nu;
int info;
int i;
double D,l;
mat_det_struct *mdet;
nu =GetInPortRows(block,1);
u=GetRealInPortPtrs(block,1);
y=GetRealOutPortPtrs(block,1);
/*init : initialization*/
if (flag==4)
{if((*(block->work)=(mat_det_struct*) scicos_malloc(sizeof(mat_det_struct)))==NULL)
{set_block_error(-16);
return;}
mdet=*(block->work);
if((mdet->ipiv=(int*) scicos_malloc(sizeof(int)*nu))==NULL)
{set_block_error(-16);
scicos_free(mdet);
return;}
if((mdet->wrk=(double*) scicos_malloc(sizeof(double)*(nu*nu)))==NULL)
{set_block_error(-16);
scicos_free(mdet->ipiv);
scicos_free(mdet);
return;}
}
/* Terminaison */
else if (flag==5)
{mdet=*(block->work);
if(mdet->wrk!=NULL) {
scicos_free(mdet->ipiv);
scicos_free(mdet->wrk);
scicos_free(mdet);
return;}
}
else
{
mdet=*(block->work);
for (i=0;i<(nu*nu);i++) mdet->wrk[i]=u[i];
C2F(dgetrf)(&nu,&nu,mdet->wrk,&nu,mdet->ipiv,&info);
if (info !=0)
{if (flag!=6)
{set_block_error(-7);
return;}}
D=1;
for (i=0;i<nu;i++)
{if((*(mdet->ipiv+i))!=i+1) D=-D;
l=*(mdet->wrk+i*(nu+1));
D=D*l;
};
*y=D;
}
}