/usr/share/octave/packages/image-2.2.2/@strel/subsref.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 39 40 41 42 | ## Copyright (C) 2012 Carnë Draug <carandraug+dev@gmail.com>
##
## 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
## this program; if not, see <http://www.gnu.org/licenses/>.
function req = subsref (se, idx)
if (! isa (se, "strel"))
error ("object must be of the strel class but '%s' was used", class (se));
elseif (! strcmp (idx(1).type, "()") || numel (idx) > 1)
error ("incorrect syntax to reference strel object. Use obj(idx) to access elements.");
endif
if (isempty (se.seq))
## for matlab compatibility, if we don't have the sequence, then this is
## still an array of strel objects, it just happens we have we give
## back the object as longsame as 1 element sequence
## so we give the object back. This means the following:
## se(1) <-- works fine
## se(2) <-- fails
## se(1,1,1,1) <-- works fine
## se(1:3) <-- fails
## Yes, this is ugly but we don't have classdef yet...
if (any (cellfun (@(x) any (x != 1), idx(1).subs)))
error ("A(I): index out of bounds. This is not a sequence of strel object");
endif
req = se;
else
req = se.seq{idx(1).subs{:}};
endif
endfunction
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