/usr/share/octave/packages/control-2.6.2/@ss/__freqresp__.m is in octave-control 2.6.2-1build1.
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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 | ## Copyright (C) 2009-2014 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 -*-
## Frequency response of SS models.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: October 2009
## Version: 0.6
function H = __freqresp__ (sys, w, cellflag = false)
if (sys.scaled == false)
sys = prescale (sys);
endif
[a, b, c, d, e, tsam] = dssdata (sys);
if (isct (sys)) # continuous system
s = i * w;
else # discrete system
s = exp (i * w * abs (tsam));
endif
H = arrayfun (@(x) c/(x*e - a)*b + d, s, "uniformoutput", false);
if (! cellflag)
H = cat (3, H{:});
endif
endfunction
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