/usr/share/octave/packages/signal-1.2.2/tfe.m is in octave-signal 1.2.2-1build1.
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 | %% 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/>.
%% Usage:
%% [Pxx,freq] = tfe(x,y,Nfft,Fs,window,overlap,range,plot_type,detrend)
%%
%% Estimate transfer function of system with input "x" and output "y".
%% Use the Welch (1967) periodogram/FFT method.
%% Compatible with Matlab R11 tfe and earlier.
%% See "help pwelch" for description of arguments, hints and references
%% --- especially hint (7) for Matlab R11 defaults.
function [varargout] = tfe(varargin)
%%
%% Check fixed argument
if ( nargin<2 )
error( 'tfe: Need at least 2 args. Use help tfe.' );
end
nvarargin = length(varargin);
%% remove any pwelch RESULT args and add 'trans'
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} = [];
end
end
varargin{nvarargin+1} = 'trans';
%%
saved_compatib = pwelch('R11-');
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
pwelch(saved_compatib);
end
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