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Scilabヘルプ >> Xcos > palettes > Math operations palette > BIGSOM_f


Scalar or vector Addition/Soustraction

Block Screenshot


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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Last updated:
Mon Feb 12 23:12:43 CET 2018