function A=rnd(m,n,N,nonneg)
% RND random matrix of size m x n with integer entries
%
%   RND(m,n,N,nonneg) is an n-by-m "random" matrix with
%   integer entries from -N (respecitvely, 0) to N.
%   The default values are N=9 and noneg = 0 (FALSE).
%
%   In detail, use rand() to generate floating point
%   numbers in [0,N+1] or [-N,N+1], then use floor().
%
%   Examples: A=rnd(3,5), A=rnd(3,5,99), A=rnd(3,5,99,1)
%
%   Matt Kawski 7-15-2008
%   http://math.asu.edu/~kawski
%   kawski@asu.edu
%
if nargin < 4, nonneg = 0; end
if nargin < 3, N = 9; end
if nonneg 
    A = floor((N+1)*rand(m,n));
else
    A = floor((2*N+1)*rand(m,n)-N);
end