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function [f,fl,W,wasrow,remembershape]=comp_sigreshape_pre(f,callfun,do_ndim)
%-*- texinfo -*-
%@deftypefn {Function} comp_sigreshape_pre
%@verbatim
%COMP_SIGRESHAPE_PRE
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_sigreshape_pre.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.
% TESTING: OK
% REFERENCE: OK
if ~isnumeric(f) || isempty(f)
error('%s: The input must be non-empty numeric.',upper(callfun));
end
wasrow=0;
% Rember the shape if f is multidimensional.
remembershape=size(f);
fd=length(remembershape);
% Multi-dimensional mode, apply to first dimension.
if fd>2
if (do_ndim>0) && (fd>do_ndim)
error([callfun,': ','Cannot process multidimensional arrays.']);
end;
fl=size(f,1);
W=prod(remembershape)/fl;
% Reshape to matrix if multidimensional.
f=reshape(f,fl,W);
else
if size(f,1)==1
wasrow=1;
% Make f a column vector.
f=f(:);
end;
fl=size(f,1);
W=size(f,2);
end;
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