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