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.TH boolean 1 "April 1993" "Scilab Group" "Scilab Objects"
.so ../sci.an
.SH NAME
boolean - Scilab Objects, boolean variables and operators & | ~
.SH DESCRIPTION
A boolean variable is \fV%T\fR (for "true") or \fV%F\fR (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 (\fV+, *, -, ^,\fR etc) are undefined
for booleans matrices, three special operators are defined for boolean
matrices:
.TP 10
~b
: is the element wise negation of boolean \fVb\fR (matrix).
.TP
b1&b2
: is the element wise logical \fVand\fR of \fVb1\fR and \fVb2\fR (matrices).
.TP
b1|b2
: is the element wise logical \fVor\fR of \fVb1\fR and \fVb2\fR (matrices).
.TP
Boolean variables can be used for indexing matrices or vectors.
For instance \fVa([%T,%F,%T],:)\fR returns the submatrix
made of rows \fV1\fR and \fV3\fR of \fVa\fR.
Boolean sparse matrices are supported.
.SH EXAMPLE
.nf
[1,2]==[1,3]
[1,2]==1
a=1:5; a(a>2)
.fi
.SH SEE ALSO
matrices, or, and, not
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