Mercurial > hg > octave-lyh
annotate scripts/image/autumn.m @ 14554:69eec23c8b3d
allow kron to work for two diag matrix arguments (bug #35647)
* kron.cc (dispatch_kron): Fix recursive call for case of two diagonal
matrix objects as arguments. New tests.
author | John W. Eaton <jwe@octave.org> |
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date | Thu, 12 Apr 2012 14:01:39 -0400 |
parents | f205d0074687 |
children | b9c02ee24de1 |
rev | line source |
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maint: update copyright notices for 2012
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1 ## Copyright (C) 1999-2012 Kai Habel |
6788 | 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. | |
6788 | 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/>. | |
6788 | 18 |
19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {@var{map} =} autumn () |
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21 ## @deftypefnx {Function File} {@var{map} =} autumn (@var{n}) |
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22 ## Create color colormap. This colormap ranges from red through orange |
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23 ## to yellow. |
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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. |
6788 | 26 ## @seealso{colormap} |
27 ## @end deftypefn | |
28 | |
29 ## Author: Kai Habel <kai.habel@gmx.de> | |
30 | |
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31 function map = autumn (n) |
6788 | 32 |
33 if (nargin == 0) | |
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34 n = rows (colormap); |
6788 | 35 elseif (nargin == 1) |
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36 if (! isscalar (n)) |
6788 | 37 error ("autumn: argument must be a scalar"); |
38 endif | |
39 else | |
40 print_usage (); | |
41 endif | |
42 | |
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43 if (n == 1) |
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44 map = [1, 0, 0]; |
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45 elseif (n > 1) |
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46 r = ones (n, 1); |
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47 g = [0:(n-1)]' / (n - 1); |
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48 b = zeros (n, 1); |
6788 | 49 map = [r, g, b]; |
50 else | |
51 map = []; | |
52 endif | |
53 | |
54 endfunction | |
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55 |
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56 |
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57 %!demo |
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58 %! ## Show the 'autumn' colormap as an image |
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59 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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60 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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61 %! colormap (autumn (64)); |
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62 |