NTRUE

NTRUE - Logical array with a specific number of true values
NTRUE(N,P,Q, ...) or NTRUE(N,[P Q ...]) creates a logical array of size
[P Q ...] with N randomly positioned true values. NTRUE(N,P) is short for
NTRUE(N,P,P). All arguments (N,P,Q,...) are positive scalars.

NTRUE(N) creates a N-ny-N matrix with N true values.

Example:
NTRUE(5,3,4) % creates a 3-by-4 matrix with 5 true (and 7 false)
values, for instance:
% 0 0 0 0
% 1 1 0 0
% 1 0 1 1

See also TRUE, FALSE, ONES, ZEROS,
and SLM, SHAKE, NONES (on the MatLab FEX)