Scicos Block
fr - eng

Mathematical expression

Contents

• Mathematical expression
  • Palette
  • Description
  • Dialog box
  • Default properties
  • Interfacing function
  • Computational function
  • Authors

Palette

• Non_linear - Non-Linear palette

Description

The output of the Expression block is specified by a scalar Scilab expression in terms of variables u1,...,un where ui represents either the ith scalar input of the block or the ith entry of its unique input.
The mathematical functions allowed are : sin, cos, tan, exp, log, sinh, cosh, tanh, int, round, ceil, floor, sign, abs, max, min, asin, acos, atan, asinh, acosh, atanh, atan2, log10.

Dialog box

• Number of inputs
  Block input can be a scalar or vector.
  Properties : Type 'vec' of size 1

• Scilab expression
  The Scilab expression applied to the input.
  Properties : Type 'vec' of size 1

• Use zero-crossing
  Select to enable zero crossing detection.
  Properties : Type 'vec' of size 1

Default properties

• always active: no
• direct-feedthrough: yes
• zero-crossing: yes
• mode: yes
• 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: evaluate_expr

Interfacing function

• SCI/macros/scicos_blocks/Misc/EXPRESSION.sci [view code]

Computational function

• SCI/routines/scicos/evaluate_expr.c (Type 4) [view code]

Authors

Ramine Nikoukhah INRIA