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function assert_squarelat(a,M,R,callfun,flag)
%-*- texinfo -*-
%@deftypefn {Function} assert_squarelat
%@verbatim
%ASSERT_SQUARELAT Validate lattice and window size.
% Usage: assert_squarelat(a,M,R,callfun,flag);
%
% Input parameters:
% a : Length of time shift.
% M : Number of modulations.
% R : Number of multiwindows.
% callfun : Name of calling function.
% flag : See below.
%
% if flag>0 test if system is at least critically sampled.
%
% This routine deliberately checks the validity of M before a, such
% that it can be used for DWILT etc., where you just pass a=M.
%
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/assert_squarelat.html}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% This program 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.
%
% This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
if nargin==4
flag=0;
end;
if (prod(size(M))~=1 || ~isnumeric(M))
error('%s: M must be a scalar',callfun);
end;
if (prod(size(a))~=1 || ~isnumeric(a))
error('%s: a must be a scalar',callfun);
end;
if rem(M,1)~=0
error('%s: M must be an integer',callfun);
end;
if rem(a,1)~=0
error('%s: a must be an integer',callfun);
end;
if flag>0
if a>M*R
error('%s: The lattice must not be undersampled',callfun);
end;
end;
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