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function f=rand_wpe(varargin)
%-*- texinfo -*-
%@deftypefn {Function} rand_wpe
%@verbatim
%RAND_HPE Random WPE even function.
% Usage: f=rand_wpe(s);
%
% RAND_WPE(s) generates an array of size s, which is WPE along the
% first dimension.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/testing/rand_wpe.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/>.
if isnumeric(varargin);
s=varargin;
else
s=cell2mat(varargin);
end;
if length(s)==1
error('To avoid confusion, the size must be at least two-dimensional.');
end;
shalf=s;
shalf(1)=floor((shalf(1)-1)/2);
f=(randn(shalf)-.5)+(randn(shalf)-.5)*i;
if rem(s(1),2)==0
f=[randn([1 s(2:end)])-.5; ...
f; ...
randn([1 s(2:end)])-.5; ...
flipud(conj(f))];
else
f=[randn([1 s(2:end)])-.5; ...
f; ...
flipud(conj(f))];
end;
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