Computational routine
eng
mat_sing
# include "scicos_block4.h"
# include "../machine.h"
#include <stdio.h>
extern int C2F(dgesvd)();
extern int C2F(dlaset)();
extern int C2F(dlacpy)();
#if WIN32
#define NULL 0
#endif
#ifndef min
#define min(a,b) ((a) <= (b) ? (a) : (b))
#endif
#ifndef max
#define max(a,b) ((a) >= (b) ? (a) : (b))
#endif
typedef struct
{ double *LA;
double *LU;
double *LVT;
double *dwork;
} mat_sing_struct ;
void mat_sing(scicos_block *block,int flag)
{
double *u;
double *y;
int nu,mu;
int info;
int lwork;
mat_sing_struct *ptr;
mu=GetInPortRows(block,1);
nu=GetInPortCols(block,1);
u=GetRealInPortPtrs(block,1);
y=GetRealOutPortPtrs(block,1);
lwork=max(3*min(mu,nu)+max(mu,nu),5*min(mu,nu)-4);
/*init : initialization*/
if (flag==4)
{if((*(block->work)=(mat_sing_struct*) scicos_malloc(sizeof(mat_sing_struct)))==NULL)
{set_block_error(-16);
return;}
ptr=*(block->work);
if((ptr->LA=(double*) scicos_malloc(sizeof(double)*(mu*nu)))==NULL)
{set_block_error(-16);
scicos_free(ptr);
return;}
if((ptr->LU=(double*) scicos_malloc(sizeof(double)*(mu*mu)))==NULL)
{set_block_error(-16);
scicos_free(ptr->LA);
scicos_free(ptr);
return;}
if((ptr->LVT=(double*) scicos_malloc(sizeof(double)*(nu*nu)))==NULL)
{set_block_error(-16);
scicos_free(ptr->LU);
scicos_free(ptr->LA);
scicos_free(ptr);
return;}
if((ptr->dwork=(double*) scicos_malloc(sizeof(double)*lwork))==NULL)
{set_block_error(-16);
scicos_free(ptr->LVT);
scicos_free(ptr->LU);
scicos_free(ptr->LA);
scicos_free(ptr);
return;}
}
/* Terminaison */
else if (flag==5)
{ptr=*(block->work);
if(ptr->dwork!=0) {
scicos_free(ptr->LA);
scicos_free(ptr->LU);
scicos_free(ptr->LVT);
scicos_free(ptr->dwork);
scicos_free(ptr);
return;}
}
else
{
ptr=*(block->work);
C2F(dlacpy)("F",&mu,&nu,u,&mu,ptr->LA,&mu);
C2F(dgesvd)("A","A",&mu,&nu,ptr->LA,&mu,y,ptr->LU,&mu,ptr->LVT,&nu,ptr->dwork,&lwork,&info);
if (info !=0)
{if (flag!=6)
{set_block_error(-7);
return;}}
}
}