/usr/share/octave/packages/control-2.6.2/__ss_dim__.m is in octave-control 2.6.2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## 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 -*-
## Number of outputs (p), inputs (m) and states (n) of state space matrices.
## For internal use only.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: September 2009
## Version: 0.2
function [p, m, n] = __ss_dim__ (a, b, c, d, e = [])
## TODO: create oct-file?
if (! is_real_matrix (a, b, c, d, e))
error ("ss: system matrices must be real");
endif
[arows, acols] = size (a);
[brows, bcols] = size (b);
[crows, ccols] = size (c);
[drows, dcols] = size (d);
m = bcols; # = dcols
n = arows; # = acols
p = crows; # = drows
if (arows != acols)
error ("ss: system matrix a(%dx%d) is not square", arows, acols);
endif
if (brows != arows)
error ("ss: system matrices a(%dx%d) and b(%dx%d) are incompatible",
arows, acols, brows, bcols);
endif
if (ccols != acols)
error ("ss: system matrices a(%dx%d) and c(%dx%d) are incompatible",
arows, acols, crows, ccols);
endif
if (bcols != dcols)
error ("ss: system matrices b(%dx%d) and d(%dx%d) are incompatible",
brows, bcols, drows, dcols);
endif
if (crows != drows)
error ("ss: system matrices c(%dx%d) and d(%dx%d) are incompatible",
crows, ccols, drows, dcols);
endif
if (! isempty (e) && ! size_equal (e, a))
error ("ss: system matrices a(%dx%d) and e(%dx%d) are incompatible",
arows, acols, rows (e), columns (e));
endif
endfunction
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