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# boolean

Scilab Objects, boolean variables and operators & | ~

### Description

A boolean variable is `%T`

(for "true") or `%F`

(for "false"). These variables can be used to define matrices of booleans, with the usual syntax. Boolean matrices can be manipulated as ordinary matrices for elements extraction/insertion and concatenation.

Note that other usual operations ( `+` , `*` , `-` , `^` , etc) are undefined for boolean matrices. Three special operators are defined for boolean matrices: |

- ~b
is the element-wise negation of boolean

`b`

(matrix).- b1 & b2
is the element-wise logical

`and`

of`b1`

and`b2`

(matrices).- b1 | b2
is the element-wise logical

`or`

of`b1`

and`b2`

(matrices).

Boolean variables can be used for indexing matrices or vectors. For instance `a([%T,%F,%T],:)`

returns the submatrix made of rows `1`

and `3`

of `a`

. Boolean sparse matrices are supported.

### Examples

[1,2]==[1,3] [1,2]==1 a=1:5; a(a>2)

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