boolean

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)

See also

• matrices — Scilab objects, matrices in Scilab
• or — logical OR over the elements of a boolean or numerical array
• and — logical AND between the elements of a boolean or numerical array
• not — (~) logical not