Computational routine
eng

##
signum

### File content

    #include "scicos_block.h"
    #include <math.h>

    void  signum(scicos_block *block,int flag)
    {
      int i,j;
      if (flag==1){
        for(i=0;i<block->insz[0];++i){
          if (get_phase_simulation()==1||block->ng==0) {
    	if (block->inptr[0][i]<0){
    	  j=2;
    	} else if (block->inptr[0][i]>0){
    	  j=1;
    	}else{
    	  j=0;
    	}
          }else {
    	j=block->mode[i];
          }
          if (j==1){
    	block->outptr[0][i]=1.0;
          } else if(j==2){
    	block->outptr[0][i]=-1.0;
          }else{
    	block->outptr[0][i]=0.0;
          }
        }
      }else if (flag==9){
        for(i=0;i<block->insz[0];++i){
          block->g[i]=block->inptr[0][i];
          if (get_phase_simulation()==1) {
    	if(block->g[i]<0){
    	  block->mode[i]=2;
    	}else{
    	  block->mode[i]=1;
    	}
          }
        }
      }
    }