Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / image-1.0.15 / uintlut.m

diff --git a/octave_packages/image-1.0.15/uintlut.m b/octave_packages/image-1.0.15/uintlut.m
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+## 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, see <http://www.gnu.org/licenses/>.
+
+## -*- 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  2007/03/23 16:14:38  adb014
+% Update the FSF address
+%
+% Revision 1.1  2006/08/20 12:59:36  hauberg
+% Changed the structure to match the package system
+%
+% 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
+%
+%