Product

Library

Non_linear

Description

The Product block performs multiplication or division of its inputs. This block produces outputs using either element-wise or matrix multiplication, depending on the value of the Multiplication parameter. You specify the operations with the Number of inputs parameter. Multiply(+1) and divide (-1) characters indicate the operations to be performed on the inputs:

Dialog Box

Set multiplication block parameters
Number of inputs or sign vector (multiplication: + 1, division: -1)	[1;-1]

• Number of inputs or sign vector : Enter the number of inputs.

Default properties

• always active: no
• direct-feedthrough: yes
• zero-crossing: no
• mode: no
• number/sizes of inputs: 2 / -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: product

Interfacing function

scilab/macros/scicos_blocks/nonlinear/PRODUCT.sci

Computational function (type 4)

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

void product(scicos_block *block,int flag)
{
  int j,k;
  if(flag==1){
    if (block->nin==1){
      block->outptr[0][0]=1.0;
      for (j=0;j<block->insz[0];j++) {
	block->outptr[0][0]=block->outptr[0][0]*block->inptr[0][j];
      }
    }
    else {
      for (j=0;j<block->insz[0];j++) {
	block->outptr[0][j]=1.0;
	for (k=0;k<block->nin;k++) {
	  if(block->ipar[k]>0){
	    block->outptr[0][j]=block->outptr[0][j]*block->inptr[k][j];
	  }else{
	    if(block->inptr[k][j]==0){
	      set_block_error(-2);
	      return;
	    }else{
	      block->outptr[0][j]=block->outptr[0][j]/block->inptr[k][j];
	    }
	  }
	}
      }
    }
  }
}