Computational routine
eng
matz_svd
# include "scicos_block4.h"
# include "../machine.h"
#include <stdio.h>
extern int C2F(zgesvd)();
extern int C2F(dlaset)();
#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 *l0;
double *LA;
double *LU;
double *LSV;
double *LVT;
double *dwork;
double *rwork;
} mat_sdv_struct ;
void matz_svd(scicos_block *block,int flag)
{
double *ur,*ui;
double *y1r,*y2r,*y3r;
double *y1i,*y3i;
int nu,mu;
int info;
int i,j,ij,ji,ii,lwork,rw;
mat_sdv_struct *ptr;
mu=GetInPortRows(block,1);
nu=GetInPortCols(block,1);
ur=GetRealInPortPtrs(block,1);
ui=GetImagInPortPtrs(block,1);
y1r=GetRealOutPortPtrs(block,1);
y2r=GetRealOutPortPtrs(block,2);
y3r=GetRealOutPortPtrs(block,3);
y1i=GetImagOutPortPtrs(block,1);
//y2i=GetImagOutPortPtrs(block,2);
y3i=GetImagOutPortPtrs(block,3);
lwork=max(3*min(mu,nu)+max(mu,nu),5*min(mu,nu)-4);
rw=5*min(mu,nu);
/*init : initialization*/
if (flag==4)
{if((*(block->work)=(mat_sdv_struct*) scicos_malloc(sizeof(mat_sdv_struct)))==NULL)
{set_block_error(-16);
return;}
ptr=*(block->work);
if((ptr->l0=(double*) scicos_malloc(sizeof(double)))==NULL)
{set_block_error(-16);
scicos_free(ptr);
return;}
if((ptr->LA=(double*) scicos_malloc(sizeof(double)*(2*mu*nu)))==NULL)
{set_block_error(-16);
scicos_free(ptr->l0);
scicos_free(ptr);
return;}
if((ptr->LU=(double*) scicos_malloc(sizeof(double)*(2*mu*mu)))==NULL)
{set_block_error(-16);
scicos_free(ptr->LA);
scicos_free(ptr->l0);
scicos_free(ptr);
return;}
if((ptr->LSV=(double*) scicos_malloc(sizeof(double)*(min(mu,nu))))==NULL)
{set_block_error(-16);
scicos_free(ptr->LU);
scicos_free(ptr->LA);
scicos_free(ptr->l0);
scicos_free(ptr);
return;}
if((ptr->LVT=(double*) scicos_malloc(sizeof(double)*(2*nu*nu)))==NULL)
{set_block_error(-16);
scicos_free(ptr->LSV);
scicos_free(ptr->LU);
scicos_free(ptr->LA);
scicos_free(ptr->l0);
scicos_free(ptr);
return;}
if((ptr->dwork=(double*) scicos_malloc(sizeof(double)*2*lwork))==NULL)
{set_block_error(-16);
scicos_free(ptr->LVT);
scicos_free(ptr->LSV);
scicos_free(ptr->LU);
scicos_free(ptr->LA);
scicos_free(ptr->l0);
scicos_free(ptr);
return;}
if((ptr->rwork=(double*) scicos_malloc(sizeof(double)*2*rw))==NULL)
{set_block_error(-16);
scicos_free(ptr->dwork);
scicos_free(ptr->LVT);
scicos_free(ptr->LSV);
scicos_free(ptr->LU);
scicos_free(ptr->LA);
scicos_free(ptr->l0);
scicos_free(ptr);
return;}
}
/* Terminaison */
else if (flag==5)
{ptr=*(block->work);
if((ptr->rwork)!=NULL){
scicos_free(ptr->l0);
scicos_free(ptr->LA);
scicos_free(ptr->LU);
scicos_free(ptr->LSV);
scicos_free(ptr->LVT);
scicos_free(ptr->dwork);
scicos_free(ptr);
return;}
}
else
{
ptr=*(block->work);
for (i=0;i<(mu*nu);i++)
{ptr->LA[2*i]=ur[i];
ptr->LA[2*i+1]=ui[i];}
C2F(zgesvd)("A","A",&mu,&nu,ptr->LA,&mu,ptr->LSV,ptr->LU,&mu,ptr->LVT,&nu,ptr->dwork,&lwork,ptr->rwork,&info);
if (info !=0)
{if (flag!=6)
{set_block_error(-7);
return;}}
*(ptr->l0)=0;
C2F(dlaset)("F",&mu,&nu,ptr->l0,ptr->l0,y2r,&mu);
for (i=0;i<min(mu,nu);i++)
{ii=i+i*mu;
*(y2r+ii)=*(ptr->LSV+i);}
for (j=0;j<nu;j++)
{for (i=j;i<nu;i++)
{ij=i+j*nu;
ji=j+i*nu;
*(y3r+ij)=*(ptr->LVT+2*ji);
*(y3r+ji)=*(ptr->LVT+2*ij);
*(y3i+ij)=-(*(ptr->LVT+2*ji+1));
*(y3i+ji)=-(*(ptr->LVT+2*ij+1));}
}
for (i=0;i<mu*mu;i++)
{*(y1r+i)=*(ptr->LU+2*i);
*(y1i+i)=*(ptr->LU+2*i+1);}
}
}