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Ajuda do Scilab >> Xcos > palettes > Discrete_pal > DLR


Discrete transfer function

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This block realizes a SISO linear system represented by its rational transfer function (in the symbolic variable z). The rational function must be proper.


  • Numerator (z)

    This parameter sets the numerator of the transfer function.

    This must be a polynomial inz .

    Properties : Type 'pol' of size 1.

    In the provided expression, any subexpression being an exponent given either by a variable (of the context) whose name is more than 1-character long, or by an expression (not a literal integer) must end with a space to be correctly displayed on the block's icon.

    This constrain has no consequence on the computational validity of the expression.

    Examples: "z^12+1", "z^ +12+1", "z^+ 12+1" are all displayed as "z^{12}+1", while "1+z^ab+z^2" will be displayed as "1+z^{ab+z^2}" (but will be well computed as 1 + z^ab + z^2). To make it well displayed, "1+z^ab +z^2" will have to be entered (for instance). As well, "z^(ab+1) + 2" will have to be entered, instead of "z^(ab+1)+2".
  • Denominator (z)

    This parameter sets the denominator of the transfer function.

    This must be a polynomial inz .

    Properties : Type 'pol' of size 1.

    Take care about multichar exponents (see Numerator).

Default properties

  • always active: no

  • direct-feedthrough: no

  • zero-crossing: no

  • mode: no

  • regular inputs:

    - port 1 : size [1,1] / type 1

  • regular outputs:

    - port 1 : size [1,1] / type 1

  • number/sizes of activation inputs: 1

  • number/sizes of activation outputs: 0

  • continuous-time state: no

  • discrete-time state: yes

  • object discrete-time state: no

  • name of computational function: dsslti4

Interfacing function

  • SCI/modules/scicos_blocks/macros/Linear/DLR.sci

Computational function

  • SCI/modules/scicos_blocks/src/c/dsslti4.c (Type 4)

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Last updated:
Tue Feb 25 08:52:34 CET 2020