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function [f]=comp_isepdgtreal(coef,g,L,a,M,phasetype)
%-*- texinfo -*-
%@deftypefn {Function} comp_isepdgtreal
%@verbatim
%COMP_ISEPDGTREAL Separable IDGT.
% Usage: f=comp_isepdgtreal(c,g,L,a,M);
%
% This is a computational routine. Do not call it directly.
%
% Input must be in the M x N x W format, so the N and W dimension is
% combined.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_isepdgtreal.html}
%@seealso{idgt}
%@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/>.
% AUTHOR : Peter L. Soendergaard.
% TESTING: OK
% REFERENCE: OK
Lwindow=size(g,1);
if phasetype==1
% Change from time-invariant phase convention to a
% frequency-invariant one
b=L/M;
M2=floor(M/2)+1;
N=size(coef,2);
%M2short=ceil(M/2);
TimeInd = (0:(N-1))/N;
FreqInd = (0:(M2-1))*b;
phase = FreqInd'*TimeInd;
phase = exp(-2*1i*pi*phase);
% Handle multisignals
coef = bsxfun(@times,coef,phase);
end;
if L==Lwindow
% Do full-window algorithm.
% Call the computational subroutine.
f = comp_idgtreal_long(coef,g,L,a,M);
else
% Do filter bank algorithm.
% Call the computational subroutine.
f = comp_idgtreal_fb(coef,g,L,a,M);
end;
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