Mercurial > octave-nkf
annotate scripts/image/flag.m @ 20614:10ec79b47808
use new string_value method to handle value extraction errors
* __voronoi__.cc, chol.cc, colamd.cc, fftw.cc:
Use new string_value method.
author | John W. Eaton <jwe@octave.org> |
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date | Thu, 08 Oct 2015 18:15:56 -0400 |
parents | 7503499a252b |
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maint: Update copyright notices for 2015.
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1 ## Copyright (C) 1999-2015 Kai Habel |
6793 | 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. | |
6793 | 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/>. | |
6793 | 18 |
19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {@var{map} =} flag () |
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21 ## @deftypefnx {Function File} {@var{map} =} flag (@var{n}) |
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22 ## Create color colormap. This colormap cycles through red, white, blue, and |
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23 ## black with each index change. |
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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. |
6793 | 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", "flag"); |
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33 ## PKG_DEL: colormap ("unregister", "flag"); |
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34 |
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35 function map = flag (n = rows (colormap ())) |
6793 | 36 |
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37 if (nargin > 1) |
6793 | 38 print_usage (); |
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39 elseif (! isscalar (n)) |
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40 error ("flag: N must be a scalar"); |
6793 | 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 C = [1, 0, 0; 1, 1, 1; 0, 0, 1; 0, 0, 0]; |
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47 map = C(rem (0:(n-1), 4) + 1, :); |
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48 else |
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49 map = zeros (0, 3); |
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50 endif |
6793 | 51 |
52 endfunction | |
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53 |
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54 |
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55 %!demo |
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56 %! ## Show the 'flag' colormap as an image |
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57 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
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58 %! axis ([1, 64, 0, 1], "ticy", "xy"); |
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59 %! colormap (flag (64)); |
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60 |