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>
date Sun, 11 Oct 2015 23:09:01 +0200
parents 7503499a252b
children
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1 ## Copyright (C) 1999-2015 Kai Habel
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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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.
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27 ## @seealso{colormap}
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28 ## @end deftypefn
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29
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30 ## Author: Kai Habel <kai.habel@gmx.de>
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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 ()))
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36
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37 if (nargin > 1)
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38 print_usage ();
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39 elseif (! isscalar (n))
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40 error ("bone: N must be a scalar");
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41 endif
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42 n = double (n);
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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
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77 map = [r, g, b];
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78 else
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79 map = zeros (0, 3);
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80 endif
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81
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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