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diff --git a/gnuradio-core/src/utils/rainbow.m b/gnuradio-core/src/utils/rainbow.m
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+## Copyright (C) 1999,2000  Kai Habel
+##
+## 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} {} rainbow (@var{n})
+## Create color colormap. 
+## (red through yellow, green, cyan,blue,magenta to red)
+## The argument @var{n} should be a scalar.  If it
+## is omitted, the length of the current colormap or 64 is assumed.
+## @end deftypefn
+## @seealso{colormap}
+
+## Author:  Kai Habel <kai.habel@gmx.de>
+
+## 2001-09-13 Paul Kienzle <pkienzle@users.sf.net>
+## * renamed to rainbow for use with tk_octave
+## * remove reference to __current_color_map__
+
+function map = rainbow (number)
+
+  if (nargin == 0)
+    number = length(colormap);
+  elseif (nargin == 1)
+    if (! is_scalar (number))
+      error ("rainbow: argument must be a scalar");
+    endif
+  else
+    usage ("rainbow (number)");
+  endif
+
+  if (number == 1)
+    map = [1, 0, 0];  
+  elseif (number > 1)
+    h = linspace (0, 1, number)';
+    map = hsv2rgb ([h, ones(number, 1), ones(number, 1)]);
+  else
+    map = [];
+  endif
+
+endfunction