Computational routine
eng

##
matz_inv

### File content

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

    #if WIN32
    #define NULL    0
    #endif

    extern int C2F(zgetrf)();
    extern int C2F(zgetri)();
    typedef struct
    {         int *ipiv;
              double *wrk;
    	  double *LX;
    } mat_inv_struct ;
    void matz_inv(scicos_block *block,int flag)
    {
     double *ur;
     double *yr;
     double *ui;
     double *yi;
     int nu;
     int info;
     int i;
     mat_inv_struct *ptr;

     nu =GetInPortRows(block,1);
     ur=GetRealInPortPtrs(block,1);
     ui=GetImagInPortPtrs(block,1);
     yr=GetRealOutPortPtrs(block,1);
     yi=GetImagOutPortPtrs(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->wrk=(double*) scicos_malloc(sizeof(double)*(2*nu*nu)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->ipiv);
    	 scicos_free(ptr);
    	 return;}
        if((ptr->LX=(double*) scicos_malloc(sizeof(double)*(2*nu*nu)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(ptr->LX);
    	 scicos_free(ptr->ipiv);
    	 scicos_free(ptr);
    	 return;}
          }

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

    else
       {
        ptr=*(block->work);
        for (i=0;i<(nu*nu);i++)
    	{ptr->LX[2*i]=ur[i];
    	ptr->LX[2*i+1]=ui[i];}
         C2F(zgetrf)(&nu,&nu,ptr->LX,&nu,ptr->ipiv,&info);
        if (info !=0)
           {if (flag!=6)
        	{set_block_error(-7);
            return;}}
          C2F(zgetri)(&nu,ptr->LX,&nu,ptr->ipiv,ptr->wrk,&nu,&info);
    	for (i=0;i<(nu*nu);i++)
    	   {yr[i]=ptr->LX[2*i];
    	    yi[i]=ptr->LX[2*i+1];}
        }
     }