Absolute value

Library

Non_linear

Description

The Abs block outputs the absolute value of the input.

Dialog Box

Set block parameters
use zero_crossing (1: yes) (0:no)	1

• use zero_crossing : Select to enable zero crossing detection.

Default properties

• always active: no
• direct-feedthrough: yes
• zero-crossing: yes
• mode: yes
• number/sizes of inputs: 1 / -1
• number/sizes of outputs: 1 / -1
• number/sizes of activation inputs: 0 /
• number/sizes of activation outputs: 0 /
• continuous-time state: no
• discrete-time state: no
• name of computational function: absolute_value

Interfacing function

scilab/macros/scicos_blocks/nonlinear/ABS_VALUE.sci

Computational function (type 4)

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

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