/usr/share/octave/packages/image-2.6.1/private/iscolormap.m is in octave-image 2.6.1-1.
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 43 | ## Copyright (C) 2012-2015 Carnë Draug
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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/>.
## FIXME: remove once the image package is dependent on Octave 4.2 or
## later. We need a version of iscolormap that accepts values
## outside [0 1] for colourspace conversion, see patch #8713.
## So we copied this from Octave core (cset 31b4b614ed55).
## Author: Carnë Draug <carandraug+dev@gmail.com>
function retval = iscolormap (cmap)
if (nargin != 1)
print_usage;
endif
retval = (isnumeric (cmap) && isreal (cmap)
&& ndims (cmap) == 2 && columns (cmap) == 3
&& isfloat (cmap));
endfunction
%!assert (iscolormap (jet (64)))
%!assert (iscolormap ({0 1 0}), false)
%!assert (iscolormap ([0 1i 0]), false)
%!assert (iscolormap (ones (3,3,3)), false)
%!assert (iscolormap (ones (3,4)), false)
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