/usr/share/octave/packages/control-3.0.0/@lti/__lti_group__.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 | ## 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 -*-
## Block diagonal concatenation of two LTI models.
## This file is part of the Model Abstraction Layer.
## For internal use only.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: September 2009
## Version: 0.2
function retlti = __lti_group__ (lti1, lti2, dim = "blkdiag")
retlti = lti (:, :, :);
if (any (strcmpi (dim, {"blkdiag", "horzcat"}))) # blkdiag, horzcat
retlti.inname = [lti1.inname; lti2.inname];
if (nfields2 (lti1.ingroup) || nfields2 (lti2.ingroup))
m1 = numel (lti1.inname);
lti2_ingroup = structfun (@(x) x + m1, lti2.ingroup, "uniformoutput", false);
retlti.ingroup = __merge_struct__ (lti1.ingroup, lti2_ingroup);
endif
else # times, vertcat
retlti.inname = repmat ({""}, numel (lti1.inname), 1);
## retlti.ingroup remains empty struct
endif
if (any (strcmpi (dim, {"blkdiag", "vertcat"}))) # blkdiag, vertcat
retlti.outname = [lti1.outname; lti2.outname];
if (nfields2 (lti1.outgroup) || nfields2 (lti2.outgroup))
p1 = numel (lti1.outname);
lti2_outgroup = structfun (@(x) x + p1, lti2.outgroup, "uniformoutput", false);
retlti.outgroup = __merge_struct__ (lti1.outgroup, lti2_outgroup);
endif
else # times, horzcat
retlti.outname = repmat ({""}, numel (lti1.outname), 1);
## retlti.outgroup remains empty struct
endif
if (lti1.tsam == lti2.tsam)
retlti.tsam = lti1.tsam;
elseif (lti1.tsam == -2)
retlti.tsam = lti2.tsam;
elseif (lti2.tsam == -2)
retlti.tsam = lti1.tsam;
elseif (lti1.tsam == -1 && lti2.tsam > 0)
retlti.tsam = lti2.tsam;
elseif (lti2.tsam == -1 && lti1.tsam > 0)
retlti.tsam = lti1.tsam;
else
error ("lti_group: systems must have identical sampling times");
endif
endfunction
function ret = __merge_struct__ (a, b)
## FIXME: this is too complicated;
## isn't there a simple function for this task?
## bug #40224: orderfields (struct ()) errors out in Octave 3.6.4
## therefore use nfields2 to check for empty structs
if (nfields2 (a))
a = orderfields (a);
endif
if (nfields2 (b))
b = orderfields (b);
endif
fa = fieldnames (a);
fb = fieldnames (b);
[fi, ia, ib] = intersect (fa, fb);
ca = struct2cell (a);
cb = struct2cell (b);
for k = numel (fi) : -1 : 1
ca{ia(k)} = vertcat (ca{ia(k)}(:), cb{ib(k)}(:));
fb(ib(k)) = [];
cb(ib(k)) = [];
endfor
ret = cell2struct ([ca; cb], [fa; fb]);
endfunction
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