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function [coef2]=comp_idwiltii(coef,a,M)
%-*- texinfo -*-
%@deftypefn {Function} comp_idwiltii
%@verbatim
%COMP_IDWILTII Compute Inverse discrete Wilson transform type II
%
% This is a computational routine. Do not call it
% directly.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_idwiltii.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/>.
% AUTHOR : Peter L. Soendergaard
N=size(coef,1)/M;
W=size(coef,2);
L=N*a;
coef=reshape(coef,M*2,N/2,W);
coef2=zeros(2*M,N,W,assert_classname(coef));
% First and middle modulation are transferred unchanged.
coef2(1,1:2:N,:) = coef(1,:,:);
coef2(2:2:M,1:2:N,:) = -i/sqrt(2)*coef(2:2:M,:,:);
coef2(2*M:-2:M+2,1:2:N,:) = -i/sqrt(2)*coef(2:2:M,:,:);
coef2(2:2:M,2:2:N,:) = 1/sqrt(2)*coef(M+2:2:2*M,:,:);
coef2(2*M:-2:M+2,2:2:N,:) = -1/sqrt(2)*coef(M+2:2:2*M,:,:);
if M>2
coef2(3:2:M,1:2:N,:) = 1/sqrt(2)*coef(3:2:M,:,:);
coef2(2*M-1:-2:M+2,1:2:N,:) = -1/sqrt(2)*coef(3:2:M,:,:);
coef2(3:2:M,2:2:N,:) = -i/sqrt(2)*coef(M+3:2:2*M,:,:);
coef2(2*M-1:-2:M+2,2:2:N,:) = -i/sqrt(2)*coef(M+3:2:2*M,:,:);
end;
if mod(M,2)==0
coef2(M+1,2:2:N,:) = -i*coef(M+1,:,:);
else
coef2(M+1,1:2:N,:) = -i*coef(M+1,:,:);
end;
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