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## Copyright (C) 2006 Peter V. Lanspeary <pvl@mecheng.adelaide.edu.au>
##
## 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; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{Pxx}, @var{freq}] =} cpsd (@var{x}, @var{y})
## @deftypefnx {Function File} {[@dots{}] =} cpsd (@var{x}, @var{y}, @var{window})
## @deftypefnx {Function File} {[@dots{}] =} cpsd (@var{x}, @var{y}, @var{window}, @var{overlap})
## @deftypefnx {Function File} {[@dots{}] =} cpsd (@var{x}, @var{y}, @var{window}, @var{overlap}, @var{Nfft})
## @deftypefnx {Function File} {[@dots{}] =} cpsd (@var{x}, @var{y}, @var{window}, @var{overlap}, @var{Nfft}, @var{Fs})
## @deftypefnx {Function File} {[@dots{}] =} cpsd (@var{x}, @var{y}, @var{window}, @var{overlap}, @var{Nfft}, @var{Fs}, @var{range})
## @deftypefnx {Function File} {} cpsd (@dots{})
##
## Estimate cross power spectrum of data @var{x} and @var{y} by the Welch (1967)
## periodogram/FFT method.
## @seealso{pwelch}
## @end deftypefn
function varargout = cpsd(varargin)
## Check fixed argument
if (nargin < 2 || nargin > 7)
print_usage ();
endif
nvarargin = length(varargin);
## remove any pwelch RESULT args and add 'cross'
for iarg=1:nvarargin
arg = varargin{iarg};
if ( ~isempty(arg) && ischar(arg) && ( strcmp(arg,'power') || ...
strcmp(arg,'cross') || strcmp(arg,'trans') || ...
strcmp(arg,'coher') || strcmp(arg,'ypower') ))
varargin{iarg} = [];
endif
endfor
varargin{nvarargin+1} = 'cross';
##
if ( nargout==0 )
pwelch(varargin{:});
elseif ( nargout==1 )
Pxx = pwelch(varargin{:});
varargout{1} = Pxx;
elseif ( nargout>=2 )
[Pxx,f] = pwelch(varargin{:});
varargout{1} = Pxx;
varargout{2} = f;
endif
endfunction
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