Mercurial > octave-nkf
annotate scripts/image/gray.m @ 14138:72c96de7a403 stable
maint: update copyright notices for 2012
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 02 Jan 2012 14:25:41 -0500 |
parents | c792872f8942 |
children | 11949c9795a0 |
rev | line source |
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14138
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maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1994-2012 John W. Eaton |
2313 | 2 ## |
3 ## This file is part of Octave. | |
4 ## | |
5 ## Octave is free software; you can redistribute it and/or modify it | |
6 ## under the terms of the GNU General Public License as published by | |
7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
8 ## your option) any later version. | |
2313 | 9 ## |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 ## General Public License for more details. | |
14 ## | |
15 ## You should have received a copy of the GNU General Public License | |
7016 | 16 ## along with Octave; see the file COPYING. If not, see |
17 ## <http://www.gnu.org/licenses/>. | |
559 | 18 |
3381 | 19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{map} =} gray () |
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21 ## @deftypefnx {Function File} {@var{map} =} gray (@var{n}) |
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22 ## Create gray colormap. This colormap varies from black to white with |
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23 ## shades of gray. |
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24 ## The argument @var{n} must be a scalar. |
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25 ## If unspecified, the length of the current colormap, or 64, is used. |
3373 | 26 ## @end deftypefn |
1024 | 27 |
3202 | 28 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
2312 | 29 ## Created: July 1994 |
30 ## Adapted-By: jwe | |
1024 | 31 |
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32 function map = gray (n) |
1024 | 33 |
34 if (nargin == 0) | |
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35 n = rows (colormap); |
6791 | 36 elseif (nargin == 1) |
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37 if (! isscalar (n)) |
6791 | 38 error ("gray: argument must be a scalar"); |
39 endif | |
40 else | |
6046 | 41 print_usage (); |
559 | 42 endif |
43 | |
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44 gr = [0:(n-1)]'; |
559 | 45 |
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46 map = [ gr, gr, gr ] / (n - 1); |
559 | 47 |
48 endfunction | |
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49 |
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50 %!demo |
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51 %! ## Show the 'gray' colormap as an image |
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52 %! image (1:64, linspace (0, 1, 64), repmat (1:64, 64, 1)') |
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53 %! axis ([1, 64, 0, 1], "ticy", "xy") |
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54 %! colormap (gray (64)) |
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55 |