MATDIAG

Block Screenshot

Contents

• Create Diagonal Matrix

• • Palette

  • Description

  • Dialog box

  • Example

  • Default properties

  • Interfacing function

  • Computational function

  • See also

Palette

• Matrix operation palette

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:

See also

• EXTTRI - Triangular or Diagonal extraction (xcos Block)

• diag (Scilab function)