EXPRESSION

Mathematical expression

Block Screenshot

Contents

• Mathematical expression +

  • Palette
  • Description
  • Dialog box
  • Default properties
  • Example
  • Interfacing function

Palette

• User defined functions palette

Description

The Expression block applies the specified Scilab expressions to its input.

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

Example

The following example calculate an arbitrary expression with multiple different configuration or blocks. Open this example in Xcos

Interfacing function

• SCI/modules/scicos_blocks/macros/Misc/EXPRESSION.sci