/usr/share/octave/packages/signal-1.3.2/idct2.m is in octave-signal 1.3.2-1+b1.
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 44 45 46 | ## Copyright (C) 2001 Paul Kienzle <pkienzle@users.sf.net>
##
## 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{y} =} idct2 (@var{x})
## @deftypefnx {Function File} {@var{y} =} idct2 (@var{x}, @var{m}, @var{n})
## @deftypefnx {Function File} {@var{y} =} idct2 (@var{x}, [@var{m}, @var{n}])
## Compute the inverse 2-D discrete cosine transform of matrix @var{x}.
## If @var{m} and @var{n} are specified, the input is either padded or truncated
## to have @var{m} rows and @var{n} columns.
## @end deftypefn
function y = idct2 (x, m, n)
if (nargin < 1 || nargin > 3)
print_usage;
endif
if nargin == 1
[m, n] = size (x);
elseif (nargin == 2)
n = m (2);
m = m (1);
endif
if m == 1
y = idct (x.', n).';
elseif n == 1
y = idct (x, m);
else
y = idct (idct (x, m).', n).';
endif
endfunction
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