[Octave-cvsupdate] SF.net SVN: octave:[9903] trunk/octave-forge/main/image

[<car...@us...>]

Revision: 9903
          http://octave.svn.sourceforge.net/octave/?rev=9903&view=rev
Author:   carandraug
Date:     2012-03-15 12:43:09 +0000 (Thu, 15 Mar 2012)
Log Message:
-----------
iscolormap: new function to image package

Modified Paths:
--------------
    trunk/octave-forge/main/image/NEWS

Added Paths:
-----------
    trunk/octave-forge/main/image/inst/iscolormap.m

Modified: trunk/octave-forge/main/image/NEWS
===================================================================
--- trunk/octave-forge/main/image/NEWS	2012-03-15 02:49:14 UTC (rev 9902)
+++ trunk/octave-forge/main/image/NEWS	2012-03-15 12:43:09 UTC (rev 9903)
@@ -18,6 +18,7 @@
       iptchecknargin
       iptcheckstrs
       iptnum2ordinal
+      iscolormap
       normxcorr2
       wavelength2rgb
 

Added: trunk/octave-forge/main/image/inst/iscolormap.m
===================================================================
--- trunk/octave-forge/main/image/inst/iscolormap.m	                        (rev 0)
+++ trunk/octave-forge/main/image/inst/iscolormap.m	2012-03-15 12:43:09 UTC (rev 9903)
@@ -0,0 +1,39 @@
+## Copyright (C) 2012 Carnë Draug <car...@gm...>
+##
+## 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} {} iscolormap (@var{cm})
+## Return true if @var{cm} is a colormap.
+##
+## A colormap is an @var{n} row by 3 column matrix.  The columns contain red,
+## green, and blue intensities respectively.  All entries should be between 0
+## and 1 inclusive.
+##
+## @seealso{colormap}
+## @end deftypefn
+
+function bool = iscolormap (cm)
+
+  if (nargin != 1)
+    print_usage;
+  endif
+
+  bool = false;
+  if (ismatrix (cm) && isnumeric (cm) && columns(cm) == 3 &&
+      min (cm(:)) >= 0 && max (cm(:)) <= 1)
+    bool = true;
+  endif
+
+endfunction

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