.TH boolean 1 "April 1993" "Scilab Group" "Scilab Function"
.so man1/sci.an
.SH NAME
"Scilab object: boolean"  - 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 are manipulated as ordinary
matrices with usual operations and usual meaning (\fV+, *, -,\fR etc) 
.TP 10
~b
: is the negation of boolean \fVb\fR (matrix).
.TP
b1&b2
: is the logical \fVand\fR of \fVb1\fR and \fVb2\fR (matrices).
.TP
b1|b2
: is the 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.
.SH EXAMPLE
.nf
[1,2]==[1,3]
[1,2]==1
a=1:5; a(a>2)
.fi
.SH SEE ALSO
matrices, | , & , ~, or, and.