Computational routine
eng

##
rndblk_m

### File content

    #include "scicos_block4.h"
    #include "../machine.h"
    #include <math.h>
    extern double C2F(urand)();
    void rndblk_m(scicos_block *block,int flag)
    {
      double *y;
      double *rpar;
      double *z;
      int *ipar;
      int ny,my,i,iy;
      double sr,si,tl;

      my=GetOutPortRows(block,1);
      ny=GetOutPortCols(block,1);
      ipar=GetIparPtrs(block);
      rpar=GetRparPtrs(block);
      y=GetRealOutPortPtrs(block,1);
      z=GetDstate(block);

      if (flag==2||flag==4)
      {if (ipar[0]==0)
           {iy=(int)z[0];
    	for (i=0;i<my*ny;i++)
    	     {*(z+i+1)=C2F(urand)(&iy);}
           }
       else
    	{iy=(int)z[0];
    	 for (i=0;i<my*ny;i++)
    	      {do
    	         {sr=2.0*C2F(urand)(&iy)-1.0;
    		  si=2.0*C2F(urand)(&iy)-1.0;
    		  tl=sr*sr+si*si;
    		 } while(tl>1.0);
    	       z[i+1]= sr*(sqrt(-2.0*log(tl)/tl));}
    	  }
        *(z)=iy;
        }

      if (flag==1||flag==6)
          {for (i=0;i<my*ny;i++) *(y+i)=*(rpar+i)+(*(rpar+i+my*ny))*(*(z+i+1));
          }
    }