[07d29c]: / uintlut.m  Maximize  Restore  History

Download this file

58 lines (50 with data), 2.1 kB

 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
47
48
49
50
51
52
53
54
55
56
57
## Copyright (C) 2004 Josep Mones i Teixidor
##
## 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 2 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, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
## -*- texinfo -*-
## @deftypefn {Function File} {@var{B} = } uintlut (@var{A},@var{LUT})
## Computes matrix B by using A as an index to lookup table LUT.
##
## B = uintlut(A, LUT) calculates a matrix B by using @var{LUT} as a
## lookup table indexed by values in @var{A}.
##
## B class is the same as @var{LUT}.
## @end deftypefn
## Author: Josep Mones i Teixidor <jmones@puntbarra.com>
function B = uintlut(A, LUT)
if (nargin != 2)
usage("B = uintlut(A, LUT)");
endif
## We convert indexing array A to double since even CVS version of
## Octave is unable to use non-double arrays as indexing types. This
## won't be needed in the future eventually.
B=LUT(double(A));
endfunction
%!demo
%! uintlut(uint8([1,2,3,4]),uint8([255:-1:0]));
%! % Returns a uint8 array [255,254,253,252]
%!assert(uintlut(uint8([1,2,3,4]),uint8([255:-1:0])), uint8([255:-1:252]));
%!assert(uintlut(uint16([1,2,3,4]),uint16([255:-1:0])), uint16([255:-1:252]));
%!assert(uintlut(uint32([1,2,3,4]),uint32([255:-1:0])), uint32([255:-1:252]));
%!assert(uintlut(uint64([1,2,3,4]),uint64([255:-1:0])), uint64([255:-1:252]));
%
% $Log$
% Revision 1.2 2004/08/11 15:04:59 pkienzle
% Convert dos line endings to unix line endings
%
% Revision 1.1 2004/08/08 21:20:25 jmones
% uintlut and padarray functions added
%
%