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Справка Scilab >> Xcos > palettes > Matrix operation palette > MATDIAG

MATDIAG

Create Diagonal Matrix

Block Screenshot

Description

The MATDIAG block create a diagonal matrix from a 1D vector. If the input is a Mx1 vector than the output is an MxM matrix.

The equivalent function of MATDIAG in Scilab is diag(vm) with vm a column vector.

Dialog box

  • Datatype (1=real double 2=Complex)

    It indicates the type of the output. It support only the two types double (1) and complex (2). If we input another entry in this label xcos will print the message "Datatype is not supported".

    Properties : Type 'vec' of size 1.

Example

If the input of the block is U = ones(5, 1) then the output is:
y = [1 0 0 0 0 ; 0 1 0 0 0 ; 0 0 1 0 0 ; 0 0 0 1 0 ; 0 0 0 0 1]

Default properties

  • always active: no

  • direct-feedthrough: yes

  • 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: 0

  • number/sizes of activation outputs: 0

  • continuous-time state: no

  • discrete-time state: no

  • object discrete-time state: no

  • name of computational function: mat_diag

Interfacing function

  • SCI/modules/scicos_blocks/macros/MatrixOp/MATDIAG.sci

Computational function

  • SCI/modules/scicos_blocks/src/c/mat_diag.c

  • SCI/modules/scicos_blocks/src/c/matz_diag.c

Diagonal example:

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Last updated:
Tue Feb 14 15:13:33 CET 2017