Computational routine
eng

##
mat_vpv

### File content

    # include "scicos_block4.h"
    # include "../machine.h"
    #include <stdio.h>

    #if WIN32
    #define NULL    0
    #endif

    extern int C2F(dlacpy)();
    extern int C2F(dgeev)();
    extern int C2F(dlaset)();
    extern int C2F(issymmetric)();
    extern int C2F(dsyev)();
    typedef struct
    {         double *LA;
    	  double *L0;
              double *LVR;
              double *LW;
              double *LWR;
              double *LWI;
              double *dwork;
              double *dwork1;
    } mat_vps_struct ;
    void mat_vpv(scicos_block *block,int flag)
    {
     double *u;
     double *y1;
     double *y2;
     double *y3;
     double *y4;
     int nu;
     int info;
     int i,j,lwork,lwork1,ii,ij,ij1,ji;
     int symmetric;
     mat_vps_struct *ptr;

     nu =GetInPortRows(block,1);
     u=GetRealInPortPtrs(block,1);
     y1=GetRealOutPortPtrs(block,1);
     y2=GetImagOutPortPtrs(block,1);
     y3=GetRealOutPortPtrs(block,2);
     y4=GetImagOutPortPtrs(block,2);
     lwork1=4*nu;
     lwork=3*nu-1;
                 /*init : initialization*/
    if (flag==4)
       {if((*(block->work)=(mat_vps_struct*) scicos_malloc(sizeof(mat_vps_struct)))==NULL)
    	{set_block_error(-16);
    	 return;}
        ptr=*(block->work);
        if((ptr->LA=(double*) scicos_malloc(sizeof(double)*(nu*nu)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->L0=(double*) scicos_malloc(sizeof(double)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->LA);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->LVR=(double*) scicos_malloc(sizeof(double)*(nu*nu)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->L0);
    	 scicos_free(ptr->LA);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->LW=(double*) scicos_malloc(sizeof(double)*(nu*nu)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->LVR);
    	 scicos_free(ptr->L0);
    	 scicos_free(ptr->LA);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->LWR=(double*) scicos_malloc(sizeof(double)*(nu*1)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->LW);
    	 scicos_free(ptr->LVR);
    	 scicos_free(ptr->L0);
    	 scicos_free(ptr->LA);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->LWI=(double*) scicos_malloc(sizeof(double)*(nu*1)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->LWR);
    	 scicos_free(ptr->LW);
    	 scicos_free(ptr->LVR);
    	 scicos_free(ptr->L0);
    	 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->LWI);
    	 scicos_free(ptr->LWR);
    	 scicos_free(ptr->LW);
    	 scicos_free(ptr->LVR);
    	 scicos_free(ptr->L0);
    	 scicos_free(ptr->LA);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->dwork1=(double*) scicos_malloc(sizeof(double)*lwork1))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->dwork);
    	 scicos_free(ptr->LWI);
    	 scicos_free(ptr->LWR);
    	 scicos_free(ptr->LW);
    	 scicos_free(ptr->LVR);
    	 scicos_free(ptr->L0);
    	 scicos_free(ptr->LA);
    	 scicos_free(ptr);
    	 return;}
       }

           /* Terminaison */
    else if (flag==5)
       {ptr=*(block->work);
        if(ptr->dwork1!=NULL){
        	scicos_free(ptr->LA);
        	scicos_free(ptr->L0);
        	scicos_free(ptr->LVR);
        	scicos_free(ptr->LW);
        	scicos_free(ptr->LWI);
        	scicos_free(ptr->LWR);
        	scicos_free(ptr->dwork);
        	scicos_free(ptr->dwork1);
        	scicos_free(ptr);
        	return;}
       }

    else
       {
        ptr=*(block->work);
        C2F(dlacpy)("F",&nu,&nu,u,&nu,ptr->LA,&nu);
        symmetric=1;
        for (j=0;j<nu;j++)
    	{for (i=j;i<nu;i++)
    		{ij=i+j*nu;
    		 ji=j+i*nu;
    		if (i!=j)
    			{if (*(ptr->LA+ij)==*(ptr->LA+ji)) symmetric*= 1;
    			 else { symmetric*=0;break;}}}}
        if (symmetric==1)
    	{C2F(dsyev)("V","U",&nu,ptr->LA,&nu,ptr->LW,ptr->dwork,&lwork,&info);
    	 if (info!=0)
    	    	{if (flag!=6)
    		{set_block_error(-7);
    		return;
    		}}
    	for (i=0;i<nu;i++)
    	{ii=i+i*nu;
    	 *(y1+ii)=*(ptr->LW+i);
    	}
    	C2F(dlacpy)("F",&nu,&nu,ptr->LA,&nu,y3,&nu);
    	}
         else
     	{C2F(dgeev)("N","V",&nu,ptr->LA,&nu,ptr->LWR,ptr->LWI,ptr->dwork1,&nu,ptr->LVR,&nu,ptr->dwork1,&lwork1,&info);
            if (info!=0)
    	    	{if (flag!=6)
    		{set_block_error(-7);
    		return;
    		}}

    	*(ptr->L0)=0;
    	C2F(dlaset)("F",&nu,&nu,ptr->L0,ptr->L0,y1,&nu);
    	C2F(dlaset)("F",&nu,&nu,ptr->L0,ptr->L0,y2,&nu);
    	for (i=0;i<nu;i++)
    		{ii=i+i*nu;
    		*(y1+ii)=*(ptr->LWR+i);
    		*(y2+ii)=*(ptr->LWI+i);
    		}
    	for (j=0;j<nu;j++)
    		{if (*(ptr->LWI+j)==0)
    			for (i=0;i<nu;i++)
    				{ij=i+(j)*nu;
    				 *(y3+ij)=*(ptr->LVR +ij);
    				 *(y4+ij)=0;}
    		else{
    			for (i=0;i<nu;i++)
    					{ij=i+(j)*nu;
    					 ij1=i+(j+1)*nu;
    					 *(y3+ij)=*(ptr->LVR +ij);
    					 *(y4+ij)=*(ptr->LVR +ij1);
    					 *(y3+ij1)=*(ptr->LVR +ij);
    					 *(y4+ij1)=-(*(ptr->LVR +ij1));}
    			j++;}
    		}
     	}
       }
    }