/usr/share/octave/packages/signal-1.3.0/cpsd.m is in octave-signal 1.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | ## 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; if not, see <http://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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