MATLU

Block Screenshot

Contents

• LU Factorization

• • Palette

  • Description

  • Dialog box

  • Default properties

  • Interfacing function

  • Computational function

  • See also

  • Authors

Palette

• Matrix operation palette

Description

The MATLU Block outputs two matrices L and U, with row pivoting, from the LU factorization of a square input matrix. If A is the input matrix then:

E*A=L*U where E is the permutation matrix, U an upper triangular matrix and L a lower triangular matrix.

The equivalent function of this block in Scilab is [l,u,e]=lu(A).

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.

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

  - port 2 : 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_lu

Interfacing function

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

Computational function

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

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

See also

• MATINV - Matrix Inverse (xcos Block)

• lu (Scilab function)

Authors

Fady NASSIF - INRIA