Mercurial > octave
annotate scripts/image/cool.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
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update Octave Project Developers copyright for the new year
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1 ## Copyright (C) 1999-2020 The Octave Project Developers |
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2 ## |
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3 ## See the file COPYRIGHT.md in the top-level directory of this distribution |
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4 ## or <https://octave.org/COPYRIGHT.html/>. |
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5 ## |
6788 | 6 ## |
7 ## This file is part of Octave. | |
8 ## | |
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9 ## Octave is free software: you can redistribute it and/or modify it |
6788 | 10 ## under the terms of the GNU General Public License as published by |
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11 ## the Free Software Foundation, either version 3 of the License, or |
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12 ## (at your option) any later version. |
6788 | 13 ## |
14 ## Octave is distributed in the hope that it will be useful, but | |
15 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 ## GNU General Public License for more details. |
6788 | 18 ## |
19 ## You should have received a copy of the GNU General Public License | |
7016 | 20 ## along with Octave; see the file COPYING. If not, see |
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21 ## <https://www.gnu.org/licenses/>. |
6788 | 22 |
23 ## -*- texinfo -*- | |
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24 ## @deftypefn {} {@var{map} =} cool () |
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25 ## @deftypefnx {} {@var{map} =} cool (@var{n}) |
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26 ## Create color colormap. The colormap varies from cyan to magenta. |
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27 ## |
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28 ## The argument @var{n} must be a scalar. |
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29 ## If unspecified, the length of the current colormap, or 64, is used. |
6788 | 30 ## @seealso{colormap} |
31 ## @end deftypefn | |
32 | |
33 ## Author: Kai Habel <kai.habel@gmx.de> | |
34 | |
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35 function map = cool (n) |
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37 if (nargin > 1) |
6788 | 38 print_usage (); |
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39 elseif (nargin == 1) |
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40 if (! isscalar (n)) |
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41 error ("cool: N must be a scalar"); |
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42 endif |
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43 n = double (n); |
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44 else |
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45 hf = get (0, "currentfigure"); |
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46 if (! isempty (hf)) |
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47 n = rows (get (hf, "colormap")); |
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48 else |
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49 n = 64; |
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50 endif |
6788 | 51 endif |
52 | |
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53 if (n == 1) |
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54 map = [0, 1, 1]; |
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55 elseif (n > 1) |
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56 r = [0:(n-1)]' / (n - 1); |
6788 | 57 g = 1 - r; |
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58 b = ones (n, 1); |
6788 | 59 map = [r, g, b]; |
60 else | |
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61 map = zeros (0, 3); |
6788 | 62 endif |
63 | |
64 endfunction | |
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65 |
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66 |
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67 %!demo |
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68 %! ## Show the 'cool' colormap profile and as an image |
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69 %! cmap = cool (256); |
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70 %! subplot (2, 1, 1); |
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71 %! rgbplot (cmap, "composite"); |
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72 %! subplot (2, 1, 2); |
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73 %! rgbplot (cmap); |