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function gout=fir2long(gin,Llong);
%-*- texinfo -*-
%@deftypefn {Function} fir2long
%@verbatim
%FIR2LONG Extend FIR window to LONG
% Usage: g=fir2long(g,Llong);
%
% FIR2LONG(g,Llong) will extend the FIR window g to a length Llong*
% window by inserting zeros. Note that this is a slightly different
% behaviour than MIDDLEPAD.
%
% FIR2LONG can also be used to extend a FIR window to a longer FIR
% window, for instance in order to satisfy the usual requirement that the
% window length should be divisible by the number of channels.
%
% If the input to FIR2LONG is a cell, FIR2LONG will recurse into
% the cell array.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/sigproc/fir2long.html}
%@seealso{long2fir, middlepad}
%@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/>.
complainif_argnonotinrange(nargin,2,2,mfilename);
if iscell(gin)
gout=cellfun(@(x) fir2long(x,Llong),gin,'UniformOutput',false);
else
Lfir=length(gin);
if Lfir>Llong
error('Llong must be larger than length of window.');
end;
if rem(Lfir,2)==0
% HPE middlepad works the same way as the FIR extension (e.g. just
% inserting zeros) for even-length signals.
gout=middlepad(gin,Llong,'hp');
else
% WPE middlepad works the same way as the FIR extension (e.g. just
% inserting zeros) for odd-length signals.
gout=middlepad(gin,Llong);
end;
end;
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