/usr/share/octave/packages/control-2.6.2/@lti/subsref.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 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | ## 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 -*-
## Subscripted reference for @acronym{LTI} objects.
## Used by Octave for "sys = sys(2:4, :)" or "val = sys.prop".
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: September 2009
## Version: 0.4
function a = subsref (a, s)
if (numel (s) == 0)
return;
endif
switch (s(1).type)
case "()"
idx = s(1).subs;
if (numel (idx) == 2)
a = __sys_prune__ (a, idx{1}, idx{2});
elseif (numel (idx) == 1)
a = __freqresp__ (a, idx{1});
else
error ("lti: subsref: need one or two indices");
endif
case "."
fld = s(1).subs;
a = get (a, fld);
## warning ("lti: subsref: do not use subsref for development");
otherwise
error ("lti: subsref: invalid subscript type");
endswitch
a = subsref (a, s(2:end));
endfunction
## lti: subsref
%!shared a
%! s = tf ("s");
%! G = (s+1)*s*5/(s+1)/(s^2+s+1);
%! a = G(1,1).num{1,1}(1);
%!assert (a, 5, 1e-4);
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