Mercurial > hg > octave-nkf
annotate scripts/image/bone.m @ 20815:a260a6acb70f
fix test failures introduced by a22d8a2eb0e5
* scripts/ode/private/integrate_adaptive.m: fix stepping backwards, fix
invocation of OutputFcn, fix text of some error messages
* scripts/ode/private/integrate_const.m: remove use of option OutputSave
* scripts/ode/private/integrate_n_steps.m: remove use of option OutputSave
author | Carlo de Falco <carlo.defalco@polimi.it> |
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date | Sun, 11 Oct 2015 23:09:01 +0200 |
parents | 7503499a252b |
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rev | line source |
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1 ## Copyright (C) 1999-2015 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} =} bone () |
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21 ## @deftypefnx {Function File} {@var{map} =} bone (@var{n}) |
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22 ## Create color colormap. This colormap varies from black to white with |
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23 ## gray-blue shades. |
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24 ## |
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25 ## The argument @var{n} must be a scalar. |
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26 ## If unspecified, the length of the current colormap, or 64, is used. |
6788 | 27 ## @seealso{colormap} |
28 ## @end deftypefn | |
29 | |
30 ## Author: Kai Habel <kai.habel@gmx.de> | |
31 | |
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32 ## PKG_ADD: colormap ("register", "bone"); |
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33 ## PKG_DEL: colormap ("unregister", "bone"); |
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34 |
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35 function map = bone (n = rows (colormap ())) |
6788 | 36 |
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37 if (nargin > 1) |
6788 | 38 print_usage (); |
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39 elseif (! isscalar (n)) |
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40 error ("bone: N must be a scalar"); |
6788 | 41 endif |
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42 n = double (n); |
6788 | 43 |
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44 if (n == 1) |
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45 map = [1/8 1/8 1/8]; |
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46 elseif (n == 2) |
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47 map = [1/16 1/8 1/8 |
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48 1 1 1 ]; |
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49 elseif (n > 2) |
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50 x = [0:n-1]' / (n-1); |
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51 |
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52 idx = floor (3/4*n); |
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53 nel = n - idx + 1; # number of elements |
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54 rem = mod (n, 8); |
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55 switch (rem) |
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56 case {2, 4} |
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57 base = 1 / (16 + 2*(n-rem)); |
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58 case {5, 7} |
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59 base = 1 / (24 + 2*(n-rem)); |
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60 otherwise |
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61 base = 0; |
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62 endswitch |
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63 r(1:idx,1) = 7/8 * x(1:idx); |
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64 r(idx:n,1) = linspace (7/8 * x(idx) + base, 1, nel); |
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65 |
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66 idx = floor (3/8 * n); |
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67 nel = idx + 1; |
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68 g(1:idx,1) = 7/8 * x(1:idx); |
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69 g(idx:2*idx,1) = linspace (7/8 * x(idx), 7/8 * x(2*idx) + 1/8, nel); |
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70 g(2*idx+1:n,1) = 7/8 * x(2*idx+1:n) + 1/8; |
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71 |
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72 base = 1 / (8*idx); |
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73 nel = idx; |
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74 b(1:idx,1) = linspace (base, 7/8 * x(idx) + 1/8, nel); |
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75 b(idx:n,1) = 7/8 * x(idx:n) + 1/8; |
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76 |
6788 | 77 map = [r, g, b]; |
78 else | |
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79 map = zeros (0, 3); |
6788 | 80 endif |
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81 |
6788 | 82 endfunction |
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83 |
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84 |
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85 %!demo |
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86 %! ## Show the 'bone' colormap as an image |
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87 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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88 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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89 %! colormap (bone (64)); |
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90 |