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function [b,c,d] = isint(a)
% This function tests if the input argument is an integer.
%
% INPUT
% a [double] m*n matrix.
%
% OUTPUT
% b [integer] m*n matrix of 0 and 1. b(i,j)=1 if a(i,j) is an integer.
% c [integer] p*1 vector of indices pointing to the integer elements of a.
% d [integer] q*1 vector of indices pointing to the non integer elements of a.
%
% SPECIAL REQUIREMENTS
% None.
%
% NOTES
% p+q is equal to the product of m by n.
% Copyright (C) 2009 Dynare Team
%
% This file is part of Dynare.
%
% Dynare is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
[m,n] = size(a);
b = abs(fix(a)-a)<1e-15;
if nargout>1
c = find(b==1);
d = find(b==0);
end
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