/usr/share/octave/packages/control-3.0.0/pzmap.m is in octave-control 3.0.0-2.
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 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | ## Copyright (C) 2009-2015 Lukas F. Reichlin
##
## 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} {} pzmap (@var{sys})
## @deftypefnx {Function File} {} pzmap (@var{sys1}, @var{sys2}, @dots{}, @var{sysN})
## @deftypefnx {Function File} {} pzmap (@var{sys1}, @var{'style1'}, @dots{}, @var{sysN}, @var{'styleN'})
## @deftypefnx {Function File} {[@var{p}, @var{z}] =} pzmap (@var{sys})
## Plot the poles and zeros of an LTI system in the complex plane.
## If no output arguments are given, the result is plotted on the screen.
## Otherwise, the poles and zeros are computed and returned.
##
## @strong{Inputs}
## @table @var
## @item sys
## @acronym{LTI} model.
## @item 'style'
## Line style and color, e.g. 'r' for a solid red line or '-.k' for a dash-dotted
## black line. See @command{help plot} for details.
## @end table
##
## @strong{Outputs}
## @table @var
## @item p
## Poles of @var{sys}.
## @item z
## Invariant zeros of @var{sys}.
## @end table
## @end deftypefn
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: November 2009
## Version: 0.2
function [pol_r, zer_r] = pzmap (varargin)
if (nargin == 0)
print_usage ();
endif
sys_idx = cellfun (@isa, varargin, {"lti"}); # look for LTI models
sty_idx = cellfun (@ischar, varargin); # look for strings (plot styles)
inv_idx = ! (sys_idx | sty_idx); # invalid arguments
if (any (inv_idx))
warning ("pzmap: arguments number %s are invalid and are being ignored", ...
mat2str (find (inv_idx)(:).'));
endif
if (nnz (sys_idx) == 0)
error ("pzmap: require at least one LTI model");
endif
if (nargout > 0 && (nnz (sys_idx) > 1 || any (sty_idx)))
print_usage ();
endif
if (any (find (sty_idx) < find (sys_idx)(1)))
warning ("pzmap: strings in front of first LTI model are being ignored");
endif
pol = cellfun (@pole, varargin(sys_idx), "uniformoutput", false);
zer = cellfun (@zero, varargin(sys_idx), "uniformoutput", false);
if (! nargout)
pol_re = cellfun (@real, pol, "uniformoutput", false);
pol_im = cellfun (@imag, pol, "uniformoutput", false);
zer_re = cellfun (@real, zer, "uniformoutput", false);
zer_im = cellfun (@imag, zer, "uniformoutput", false);
## extract plotting styles
tmp = cumsum (sys_idx);
tmp(sys_idx | ! sty_idx) = 0;
n = nnz (sys_idx);
sty = arrayfun (@(x) varargin(tmp == x), 1:n, "uniformoutput", false);
colororder = get (gca, "colororder");
rc = rows (colororder);
def_pol = arrayfun (@(k) {"x", "color", colororder(1+rem (k-1, rc), :)}, 1:n, "uniformoutput", false);
def_zer = arrayfun (@(k) {"o", "color", colororder(1+rem (k-1, rc), :)}, 1:n, "uniformoutput", false);
idx = cellfun (@isempty, sty);
sty_pol = sty_zer = sty;
sty_pol(idx) = def_pol(idx);
sty_zer(idx) = def_zer(idx);
pol_args = horzcat (cellfun (@horzcat, pol_re, pol_im, sty_pol, "uniformoutput", false){:});
zer_args = horzcat (cellfun (@horzcat, zer_re, zer_im, sty_zer, "uniformoutput", false){:});
leg_args = cell (1, n);
idx = find (sys_idx);
for k = 1 : n
try
leg_args{k} = inputname (idx(k));
catch
leg_args{k} = ""; # needed for pzmap (lticell{:})
end_try_catch
endfor
## FIXME: try to combine "x", "o" and style for custom colors
h = plot (pol_args{:}, zer_args{:});
grid ("on")
title ("Pole-Zero Map")
xlabel ("Real Axis")
ylabel ("Imaginary Axis")
legend (h(1:n), leg_args)
else
pol_r = pol{1};
zer_r = zer{1};
endif
endfunction
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