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