## Copyright (C) 1996, 1997 John W. Eaton
##
## This file is part of Octave.
##
## Octave 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, or (at your option)
## any later version.
##
## Octave 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 Octave; see the file COPYING.  If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.

## Colormap.

## Author: Tony Richardson <amr@mpl.ucsd.edu>
## Created: July 1994
## Adapted-By: jwe

function map = gray (number)

  if (nargin == 0)
    number = 64;
  elseif (nargin > 1)
    usage ("gray (number)");
  endif

  gr = [0:(number-1)]';

  map = [ gr, gr, gr ] / (number - 1);

endfunction