/usr/share/octave/packages/signal-1.2.2/dct2.m is in octave-signal 1.2.2-1build1.
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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 | ## 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/>.
## y = dct2 (x)
## Computes the 2-D discrete cosine transform of matrix x
##
## y = dct2 (x, m, n) or y = dct2 (x, [m n])
## Computes the 2-D DCT of x after padding or trimming rows to m and
## columns to n.
function y = dct2 (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 = dct (x.', n).';
elseif n == 1
y = dct (x, m);
else
y = dct (dct (x, m).', n).';
endif
endfunction
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