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maint: Merge default to bytecode-interpreter.
author Markus Mützel <markus.muetzel@gmx.de>
date Tue, 21 May 2024 18:29:03 +0200
parents d8e5e55c3cf5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 1999-2024 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{map} =} white ()
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28 ## @deftypefnx {} {@var{map} =} white (@var{n})
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29 ## Create color colormap. This colormap is completely white.
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30 ##
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31 ## The argument @var{n} must be a scalar.
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32 ## If @var{n} is not specified the length of the current colormap is used. If
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33 ## there is no current colormap the default value of 256 is used.
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34 ## @seealso{colormap}
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35 ## @end deftypefn
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36
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37 function map = white (n)
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38
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39 if (nargin == 1)
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40 if (! (isscalar (n) && isreal (n) && n == fix (n)))
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41 error ("white: N must be a scalar integer");
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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 = 256;
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50 endif
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51 endif
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52 map = ones (n, 3);
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53
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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 'white' colormap profile and as an image
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59 %! cmap = white (256);
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60 %! subplot (2, 1, 1);
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61 %! rgbplot (cmap, "composite");
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62 %! subplot (2, 1, 2);
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63 %! rgbplot (cmap);
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65 %!assert (size (white ()), [256, 3])
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66 %!assert (size (white (16)), [16, 3])
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67 %!assert (all ((white ()(:)) == 1), true)
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69 %!assert (white (1), [1, 1, 1])
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70 %!assert (white (true), double ([1, 1, 1]))
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71 %!assert (white (char (1)), double ([1, 1, 1]))
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72 %!assert (white (int32 (1)), double ([1, 1, 1]))
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73 %!assert (white (0), zeros (0, 3))
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74 %!assert (white (-1), zeros (0, 3))
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77 ## Input validation
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78 %!error <N must be a scalar integer> white ("foo")
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79 %!error <N must be a scalar integer> white ([1, 2, 3])
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80 %!error <N must be a scalar integer> white ({1, 2, 3})