EXTTRI
Triangular or Diagonal Extraction
Block Screenshot
Description
The EXTTRI block extracts some elements from the input matrix u. The
size of the output matrix is the same that those of the input matrix.
When the extraction type parameter is set to:
- 1 (Upper triangle): the block copies the elements on and above
the main diagonal to an output matrix. The elements below the main
diagonal are set to zero.
- 2 (Lower triangle): the block copies the elements on and below
the main diagonal to an output matrix. The elements above the main
diagonal are set to zero.
- 3 (Diagonal): the block copies the elements on the main diagonal
to an output matrix. The elements above and below the main diagonal
are set to zero.
Les fonctions équivalentes de EXTTRI dans Scilab sont respectivement
`triu(u)`_, `tril(u)`_ et `diag(u)`_
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.
- extraction type (1=lower 2=upper 3=diagonal) It indicates the
form of the output matrix. It can be an upper triangle, a lower
triangle or a diagonal matrix. Properties : Type ‘vec’ of size 1.
Example
A=[1 2 3;4 5 6;7 8 9;10 11 12]
If the extraction `type`_ is 2 then the output is
B=[1 0 0;4 5 0;7 8 9;10 11 12]
Default properties
- always active: no
- direct-feedthrough: yes
- zero-crossing: no
- mode: no
- regular inputs: - port 1 : size [-1,-2] / type 1
- regular outputs: - port 1 : size [-1,-2] / 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: extrilz
Interfacing function
- SCI/modules/scicos_blocks/macros/MatrixOp/EXTTRI.sci
Computational function
- SCI/modules/scicos_blocks/src/c/exttril.c
- SCI/modules/scicos_blocks/src/c/exttriu.c
- SCI/modules/scicos_blocks/src/c/extdiag.c
- SCI/modules/scicos_blocks/src/c/exttrilz.c
- SCI/modules/scicos_blocks/src/c/exttriuz.c
- SCI/modules/scicos_blocks/src/c/extdiagz.c