Product
Keywords: main

Subsections

- Library
- Description
- Dialog Box
- Default properties
- Interfacing function
- Computational function (type 4)

##
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];
    	    }
    	  }
    	}
          }
        }
      }
    }