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/*Calling Sequence
[Pxx, freq] = cpsd (x, y)
[…] = cpsd (x, y, window)
[…] = cpsd (x, y, window, overlap)
[…] = cpsd (x, y, window, overlap, Nfft)
[…] = cpsd (x, y, window, overlap, Nfft, Fs)
[…] = cpsd (x, y, window, overlap, Nfft, Fs, range)
cpsd (…)
Estimate cross power spectrum of data x and y by the Welch (1967) periodogram/FFT method.
See "help pwelch" for description of arguments, hints and references
*/
function varargout = cpsd(varargin)
// Check fixed argument
if (nargin < 2 || nargin > 7)
error( "Invalid number of inputs" );
end
nvarargin = length(varargin);
// remove any pwelch RESULT args and add 'cross'
for iarg=1:nvarargin
arg = varargin(iarg);
if ( ~isempty(arg) && (type(arg) == 10 ) && ( ~strcmp(arg,'power') || ...
~strcmp(arg,'cross') || ~strcmp(arg,'trans') || ...
~strcmp(arg,'coher') || ~strcmp(arg,'ypower') ))
varargin(iarg) = [];
end
end
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;
end
endfunction
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