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# BIGSOM_f

Scalar or vector Addition/Soustraction

### Block Screenshot

### Contents

### Palette

### Description

This block performs addition or soustraction on its scalar or vector inputs.The user can adjust
the gain for each input with the parameter **Inputs ports signs/gain**.
The behavior of the block is summarized in the following table :

Number of inputs |
Operation |
Remarks |

One | y = k*u | k is the scalar value in Inputs ports signs/gain parameter.
The block has the behavior of a gain. |

Two or more | y = k[1]*u1+k[2]*u2+...+k[n]*uN | k is the vector value write in Inputs ports signs/gain parameter.
To subtract an input ui, set a negative value in k[i]. |

### Dialog box

**Inputs ports signs/gain**Set sign and a gain for each inputs.

Properties : Type 'vec' of size -1.

### Default properties

**always active:**no**direct-feedthrough:**yes**zero-crossing:**no**mode:**no**regular inputs:****- port 1 : size [-1,1] / type 1****- port 2 : size [-1,1] / type 1****regular outputs:****- port 1 : size [-1,1] / type 1****number/sizes of activation inputs:**0**number/sizes of activation outputs:**0**continuous-time state:**no**discrete-time state:**no**object discrete-time state:**no**name of computational function:***sum*

### Interfacing function

SCI/modules/scicos_blocks/macros/Linear/BIGSOM_f.sci

### Computational function

SCI/modules/scicos_blocks/src/c/sum.c (Type 2)

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