/usr/share/octave/packages/image-2.2.2/private/istform.m is in octave-image 2.2.2-1.
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 | ## Copyright (C) 2012 Pantxo Diribarne
##
## This program 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.
##
## This program 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## Private internal function to check if a argument is a transformation
## structure (as created by maketform and to be use by findbounds,
## imtransform, and the like)
## Author: Pantxo Diribarne <pantxo@dibona>
function out = istform (T)
out = true;
if (!isstruct (T))
out = false;
else
required = {"ndims_in";"ndims_out"; ...
"forward_fcn"; "inverse_fcn"; ...
"tdata"};
fields = fieldnames (T);
tst = cellfun (@(x) any (strcmp (fields, x)), required);
if (! all (tst))
out = false
endif
endif
endfunction
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