/usr/share/octave/packages/control-2.6.2/pzmap.m is in octave-control 2.6.2-1build1.
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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} {} 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
## Transmission 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
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);
sys_idx = find (sys_idx);
tmp = cellfun (@ischar, varargin);
style_idx = find (tmp);
len = numel (pol);
pol_args = {};
zer_args = {};
legend_args = cell (len, 1);
colororder = get (gca, "colororder");
rc = rows (colororder);
for k = 1 : len
col = colororder(1+rem (k-1, rc), :);
if (k == len)
lim = nargin;
else
lim = sys_idx(k+1);
endif
style = varargin(style_idx(style_idx > sys_idx(k) & style_idx <= lim));
if (isempty (style))
pol_args = cat (2, pol_args, pol_re{k}, pol_im{k}, {"x", "color", col});
zer_args = cat (2, zer_args, zer_re{k}, zer_im{k}, {"o", "color", col});
else
pol_args = cat (2, pol_args, pol_re{k}, pol_im{k}, style);
zer_args = cat (2, zer_args, zer_re{k}, zer_im{k}, style);
endif
try
legend_args{k} = inputname(sys_idx(k));
catch
legend_args{k} = "";
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:len), legend_args)
else
pol_r = pol{1};
zer_r = zer{1};
endif
endfunction
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