Scicos Block
fr - eng

##
EXTRACT: Matrix Extractor

### Contents

- EXTRACT: Matrix Extractor
  - Palette
  - Description
  - Dialog box
  - Example
  - Default properties
  - Interfacing function
  - Computational function
  - See also
  - Authors

### Palette

- Matrix - Matrix operation palette

### Description

The EXTRACT block extracts some elements from the matrix. The size of the output depends on the number of rows and number of columns to extract.

### 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 Scicos will print the message "Datatype is not supported".
  Properties : Type 'vec' of size 1.

- Lines to extract
  It indicates the numbers of the lines to extract.
  Properties : Type 'mat' of size [1,-1].

- Columns to extract
  It indicates the numbers of the columns to extract.
  Properties : Type 'mat' of size [1,-1].

### Example

    A=[1 2 3;4 5 6;7 8 9]
    If the "Lines to extract" is 1 and 2 and the "Column to extract" is 1 and 3 then the output is
    B=[1 3;4 6]

### 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 [1,1] / 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: extract

### Interfacing function

- SCI/macros/scicos_blocks/MatrixOp/EXTRACT.sci [view code]

### Computational function

- SCI/routines/scicos/extract.c [view code]
- SCI/routines/scicos/extractz.c [view code]

### See also

- EXTTRI - EXTTRI: Triangular or Diagonal extraction (Scicos Block)

### Authors

Fady NASSIF INRIA