/usr/share/octave/packages/control-2.6.2/__iddata_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/>.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: October 2011
## Version: 0.1
function [p, m, e] = __iddata_dim__ (y, u)
e = numel (y); # number of experiments
if (isempty (u)) # time series data, outputs only
[p, m] = cellfun (@__experiment_dim__, y, "uniformoutput", false);
elseif (e == numel (u)) # outputs and inputs present
[p, m] = cellfun (@__experiment_dim__, y, u, "uniformoutput", false);
else
error ("iddata: require input and output data with matching number of experiments");
endif
if (e > 1 && ! isequal (p{:}))
error ("iddata: require identical number of output channels for all experiments");
endif
if (e > 1 && ! isequal (m{:}))
error ("iddata: require identical number of input channels for all experiments");
endif
p = p{1};
m = m{1};
endfunction
function [p, m] = __experiment_dim__ (y, u = [])
if (! is_matrix (y, u))
error ("iddata: inputs and outputs must be real or complex matrices");
endif
[ly, p] = size (y);
[lu, m] = size (u);
if (! isempty (u) && ly != lu)
error ("iddata: matrices 'y' (%dx%d) and 'u' (%dx%d) must have the same number of samples (rows)", ...
ly, p, lu, m);
endif
if (ly < p)
warning ("iddata:transpose", "iddata: more outputs than samples - matrice 'y' should probably be transposed");
endif
if (lu < m)
warning ("iddata:transpose", "iddata: more inputs than samples - matrice 'u' should probably be transposed");
endif
endfunction
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