Computational routine
eng

##
matz_lu

### File content

    # include "scicos_block4.h"
    # include "../machine.h"
    #include <stdio.h>
    extern int C2F(zgetrf)();
    extern int C2F(dlaswp)();

    #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
    {         int *ipiv;
              double *dwork;
    	  double *IL;
    	  double *IU;
    } mat_lu_struct ;
    void matz_lu(scicos_block *block,int flag)
    {
     double *ur;
     double *ui;
     double *y1r;
     double *y1i;
     double *y2r;
     double *y2i;
     int mu;
     int nu;
     int info;
     int i,j,l,ij,ik,ij1;
     mat_lu_struct *ptr;

     mu =GetInPortRows(block,1);
     nu =GetInPortCols(block,1);
     ur=GetRealInPortPtrs(block,1);
     ui=GetImagInPortPtrs(block,1);
     y1r=GetRealOutPortPtrs(block,1);
     y1i=GetImagOutPortPtrs(block,1);
     y2r=GetRealOutPortPtrs(block,2);
     y2i=GetImagOutPortPtrs(block,2);
     l=min(mu,nu);
                 /*init : initialization*/
    if (flag==4)
       {if((*(block->work)=(mat_lu_struct*) scicos_malloc(sizeof(mat_lu_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)*(2*mu*nu)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->ipiv);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->IL=(double*) scicos_malloc(sizeof(double)*(mu*l)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->dwork);
    	 scicos_free(ptr->ipiv);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->IU=(double*) scicos_malloc(sizeof(double)*(l*nu)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->IL);
    	 scicos_free(ptr->dwork);
    	 scicos_free(ptr->ipiv);
    	 scicos_free(ptr);
    	 return;}
       }

           /* Terminaison */
    else if (flag==5)
       {ptr=*(block->work);
        if((ptr->IU)!=NULL){
        	scicos_free(ptr->ipiv);
        	scicos_free(ptr->dwork);
        	scicos_free(ptr->IL);
        	scicos_free(ptr->IU);
        	scicos_free(ptr);
        	return;}
       }

    else
       {
        ptr=*(block->work);
        for (i=0;i<(mu*nu);i++)
    	{ptr->dwork[2*i]=ur[i];
    	ptr->dwork[2*i+1]=ui[i];}
        C2F(zgetrf)(&mu,&nu,ptr->dwork,&mu,ptr->ipiv,&info);
        if (info !=0)
           {if (flag!=6)
       	{set_block_error(-7);
            return;}}
       for (j=0;j<l;j++)
    	{for (i=0;i<mu;i++)
    	     {ij=i+j*mu;
    	      ij1=2*ij;
    	      if (i==j)
    		{*(y2r+ij)=1;
    		 *(y2i+ij)=0;}
    	      else if (i>j)
    		{*(y2r+ij)=*(ptr->dwork+ij1);
    		 *(y2i+ij)=*(ptr->dwork+ij1+1);}
    	      else
    		{*(y2r+ij)=0;
    		 *(y2i+ij)=0;}
    	      }
    	}
    	for (j=0;j<nu;j++)
    	{for (i=0;i<l;i++)
    	     {ij=i+j*l;
    	      ik=2*(i+j*mu);
    	      if (i<=j)
    		{*(y1r+ij)=*(ptr->dwork+ik);
    		 *(y1i+ij)=*(ptr->dwork+ik+1);}
    	      else
    		{*(y1r+ij)=0;
    		 *(y1i+ij)=0;}
    	     }
     	}
       }
    }