/usr/share/octave/packages/control-2.6.2/@lti/zpkdata.m is in octave-control 2.6.2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## This file is part of LTI Syncope.
##
## LTI Syncope 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.
##
## LTI Syncope 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 LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{z}, @var{p}, @var{k}, @var{tsam}] =} zpkdata (@var{sys})
## @deftypefnx {Function File} {[@var{z}, @var{p}, @var{k}, @var{tsam}] =} zpkdata (@var{sys}, @var{"v"})
## Access zero-pole-gain data.
##
## @strong{Inputs}
## @table @var
## @item sys
## Any type of @acronym{LTI} model.
## @item "v", "vector"
## For SISO models, return @var{z} and @var{p} directly as column vectors
## instead of cells containing a single column vector.
## @end table
##
## @strong{Outputs}
## @table @var
## @item z
## Cell of column vectors containing the zeros for each channel.
## z@{i,j@} contains the zeros from input j to output i.
## @item p
## Cell of column vectors containing the poles for each channel.
## p@{i,j@} contains the poles from input j to output i.
## @item k
## Matrix containing the gains for each channel.
## k(i,j) contains the gain from input j to output i.
## @item tsam
## Sampling time in seconds. If @var{sys} is a continuous-time model,
## a zero is returned.
## @end table
## @end deftypefn
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: September 2011
## Version: 0.1
function [z, p, k, tsam] = zpkdata (sys, rtype = "cell")
[num, den, tsam] = tfdata (sys);
z = cellfun (@roots, num, "uniformoutput", false);
p = cellfun (@roots, den, "uniformoutput", false);
k = cellfun (@(n,d) n(1)/d(1), num, den);
if (strncmpi (rtype, "v", 1) && issiso (sys))
z = z{1};
p = p{1};
endif
endfunction
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