/usr/share/octave/packages/control-3.0.0/__frequency_response__.m is in octave-control 3.0.0-1.
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 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 | ## 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 -*-
## Return frequency response H and frequency vector w.
## If w is empty, it will be calculated by __frequency_vector__.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: November 2009
## Version: 0.7
function [H, w, sty, leg] = __frequency_response__ (caller, args, nout = 0)
## CALLER | MIMO | RANGE | CELL |
## ---------------+-------+-------+-------+
## bode | false | std | false |
## bodemag | false | std | false |
## margin | false | std | false |
## nichols | false | ext | false |
## nyquist | false | ext | false |
## sensitivity | false | ext | false |
## sigma | true | std | true |
mimoflag = false;
cellflag = false;
wbounds = "std";
if (strcmp (caller, {"sigma"}))
mimoflag = true;
cellflag = true;
endif
if (any (strcmp (caller, {"nyquist", "nichols", "sensitivity"})))
wbounds = "ext";
endif
sys_idx = cellfun (@isa, args, {"lti"}); # look for LTI models
frd_idx = cellfun (@isa, args, {"frd"}); # look for FRD models
w_idx = cellfun (@is_real_vector, args); # look for frequency vectors
r_idx = cellfun (@iscell, args); # look for frequency ranges {wmin, wmax}
s_idx = cellfun (@ischar, args); # look for strings (style arguments)
inv_idx = ! (sys_idx | w_idx | r_idx | s_idx); # look for invalid arguments
if (any (inv_idx))
warning ("%s: argument(s) number %s are invalid and are being ignored", ...
caller, mat2str (find (inv_idx)(:).'));
endif
if (nnz (sys_idx) == 0)
error ("%s: require at least one LTI model", caller);
endif
if (nout > 0 && (nnz (sys_idx) > 1 || any (s_idx)))
evalin ("caller", "print_usage ()");
endif
if (! mimoflag && ! all (cellfun (@issiso, args(sys_idx))))
error ("%s: require SISO systems", caller);
endif
if (any (find (s_idx) < find (sys_idx)(1)))
warning ("%s: strings in front of first LTI model are being ignored", caller);
endif
## determine frequency vectors
if (any (r_idx)) # if there are frequency ranges
if (nnz (r_idx) > 1)
warning ("%s: several frequency ranges specified, taking the last one", caller);
endif
r = args(r_idx){end};
if (numel (r) == 2 && issample (r{1}) && issample (r{2}) && r{1} < r{2})
w = __frequency_vector__ (args(sys_idx), wbounds, r{1}, r{2});
else
error ("%s: the cell defining the desired frequency range is invalid", caller);
endif
elseif (any (w_idx)) # are there any frequency vectors?
if (nnz (r_idx) > 1)
warning ("%s: several frequency vectors specified, taking the last one", caller);
endif
w = args(w_idx){end};
w = repmat ({w}, 1, nnz (sys_idx));
else # there are neither frequency ranges nor vectors
w = __frequency_vector__ (args(sys_idx), wbounds);
endif
## temporarily save frequency vectors of FRD models
w_frd = cellfun (@(x) get (x, "w"), args(frd_idx), "uniformoutput", false);
w(frd_idx) = {[]}; # freqresp returns all frequencies of FRD models for w=[]
## compute frequency response H for all LTI models
H = cellfun (@__freqresp__, args(sys_idx), w, {cellflag}, "uniformoutput", false);
## restore frequency vectors of FRD models in w
w(frd_idx) = w_frd;
## extract plotting styles
tmp = cumsum (sys_idx);
tmp(sys_idx | ! s_idx) = 0;
n = nnz (sys_idx);
sty = arrayfun (@(x) args(tmp == x), 1:n, "uniformoutput", false);
## get system names for legend
## "''" needed for bode (lticell{:})
leg = cell (1, n);
idx = find (sys_idx);
for k = 1:n
leg{k} = evalin ("caller", sprintf ("inputname(%d)", idx(k)), "''");
endfor
endfunction
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