/usr/share/octave/packages/image-2.2.2/corr2.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 | ## Copyright (C) 2000 Kai Habel <kai.habel@gmx.de>
##
## 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/>.
## -*- texinfo -*-
## @deftypefn {Function File} @var{r} = corr2 (@var{I},@var{J})
## Compute correlation coefficients of images.
##
## The two images @var{I} and @var{J} must be real type matrices or vectors of
## same size.
## @seealso{corr, cov, std2}
## @end deftypefn
function r = corr2 (I, J)
if (nargin != 2)
print_usage ();
elseif (! isimage (I) || ! isimage (J))
error ("corr2: I and J must be real matrices");
elseif (! size_equal (I, J))
error ("corr2: I and J must be of same size");
endif
r = corr (I(:), J(:));
endfunction
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