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function h=ref_tconv(f,g,a)
%-*- texinfo -*-
%@deftypefn {Function} ref_tconv
%@verbatim
%REF_PCONV Reference TCONV
% Usage: h=ref_tconv(f,g,a)
%
% TCONV(f,g,a) computes the twisted convolution of f and g.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/reference/ref_tconv.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/>.
% AUTHOR: Peter L. Soendergaard
M=size(f,1);
N=size(f,2);
h=zeros(M,N);
theta=a/M;
for m=0:M-1
for n=0:N-1
for l=0:N-1
for k=0:M-1
h(m+1,n+1)=h(m+1,n+1)+f(k+1,l+1)*g(mod(m-k,M)+1,mod(n-l,N)+1)*...
exp(2*pi*i*theta*(m-k)*l);
end;
end;
end;
end;
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