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function c=ref_rdgt_1(f,g,a,M)
%-*- texinfo -*-
%@deftypefn {Function} ref_rdgt_1
%@verbatim
%REF_RDGT_1 Reference Real DGT by fac. and RDFT
% Usage: c=ref_rdgt_1(f,g,a,M);
%
% Compute the factorization and use RDFT
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/reference/ref_rdgt_1.html}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.2.0
%
% 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/>.
L=size(f,1);
W=size(f,2);
R=size(g,2);
N=L/a;
gf=comp_wfac(g,a,M);
% Compute the window application and the DFT modulation.
c=zeros(M*N*R,W);
c(:)=ref_rdft(comp_dgt_fw(f,gf,L,a,M));
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