matz_det_routcos

Computational routine
eng

##
matz_det

### File content

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

    #if WIN32
    #define NULL    0
    #endif

    //#include <essl.h>
    typedef struct FCOMPLEX {double r,i;} fcomplex;
    extern int C2F(zgetrf)();
    typedef struct
    {         int *ipiv;
              double *wrk;
    } mat_det_struct ;
    void matz_det(scicos_block *block,int flag)
    {
     double *ur;
     double *yr;
     double *ui;
     double *yi;
     int nu;
     int info;
     int i;
     fcomplex D,l;
     double A;
     mat_det_struct *mdet;

     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_det_struct*) scicos_malloc(sizeof(mat_det_struct)))==NULL)
    	{set_block_error(-16);
    	 return;}
        mdet=*(block->work);
        if((mdet->ipiv=(int*) scicos_malloc(sizeof(int)*nu))==NULL)
    	{set_block_error(-16);
    	 scicos_free(mdet);
    	 return;}
        if((mdet->wrk=(double*) scicos_malloc(sizeof(double)*(2*nu*nu)))==NULL)
    	{set_block_error(-16);
    	 scicos_free(mdet->ipiv);
    	 scicos_free(mdet);
    	 return;}
        }

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

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