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function h = ref_lconv(f,g,ctype)
%-*- texinfo -*-
%@deftypefn {Function} ref_lconv
%@verbatim
%REF_LCONV Reference linear convolution
% Usage: h=ref_lconv(f,g)
%
% PCONV(f,g) computes the linear convolution of f and g.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/reference/ref_lconv.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: Jordy van Velthoven
Lf = length(f);
Lg = length(g);
Lh = Lf+Lg-1;
f = [f; zeros(Lh - Lf, 1)];
g = [g; zeros(Lh - Lg, 1)];
h = zeros(Lf+Lg-1, 1);
switch(lower(ctype))
case {'default'}
for ii = 0 : Lh-1
for jj = 0 : Lh-1
h(ii+1)=h(ii+1)+f(jj+1)*g(mod(ii-jj,Lh)+1);
end
end
case {'r'}
for ii=0:Lh-1
for jj=0:Lh-1
h(ii+1)=h(ii+1)+f(jj+1)*conj(g(mod(jj-ii, Lh)+1));
end;
end;
case {'rr'}
for ii=0:Lh-1
for jj=0:Lh-1
h(ii+1)=h(ii+1)+conj(f(mod(-jj, Lh)+1))*conj(g(mod(jj-ii,Lh)+1));
end;
end;
end
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