/usr/share/octave/packages/control-3.0.0/@ss/__sys2tf__.m is in octave-control 3.0.0-2.
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 | ## 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 -*-
## SS to TF conversion.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: October 2009
## Version: 0.7
function [retsys, retlti] = __sys2tf__ (sys)
sg_flag = false; # static gain flag
try
[a, b, c, d, tsam, scaled] = ssdata (sys); # system could be a descriptor model
if (tsam == -2 || isempty (a)) # static gain
sg_flag = true;
else
[num, den] = __sl_tb04bd__ (a, b, c, d, scaled);
endif
catch
if (strcmp (lasterror.identifier, "dss:improper"))
## sys is non-realizable, therefore ssdata failed.
if (issiso (sys))
[num, den] = __siso_ss2tf__ (sys);
else
[p, m] = size (sys);
num = cell (p, m);
den = cell (p, m);
for i = 1 : p
for j = 1 : m
idx = substruct ("()", {i, j});
tmp = subsref (sys, idx); # extract siso model
tmp = sminreal (tmp); # sminreal is more suitable than minreal here
[n, d] = __siso_ss2tf__ (tmp);
num(i, j) = n;
den(i, j) = d;
endfor
endfor
endif
tsam = get (sys, "tsam");
else
## something else happened
rethrow (lasterror);
endif
end_try_catch
if (sg_flag)
retsys = tf (d);
else
retsys = tf (num, den, tsam); # tsam needed to set appropriate tfvar
endif
retlti = sys.lti; # preserve lti properties
endfunction
function [num, den] = __siso_ss2tf__ (sys)
if (isempty (sys.a)) # static gain
num = sys.d;
den = 1;
else # default case
[zer, gain] = zero (sys);
pol = pole (sys);
num = gain * real (poly (zer));
den = real (poly (pol));
endif
endfunction
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