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annotate scripts/general/subsindex.m @ 20177:15e5eb7a0c1d

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make dist: add updated zoom images to EXTRADIST (bug #44579) * libgui/graphics/module.mk: add graphics/images/zoom-in.png, graphics/images/zoom-out.png, remove graphics/images/zoom.png
author John Donoghue
date Thu, 19 Mar 2015 08:37:47 -0400
parents 4197fc428c7d
children 7503499a252b
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rev   line source
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1 ## Copyright (C) 2008-2015 David Bateman
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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{idx} =} subsindex (@var{a})
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21 ## Convert an object to an index vector. When @var{a} is a class object
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22 ## defined with a class constructor, then @code{subsindex} is the
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23 ## overloading method that allows the conversion of this class object to
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24 ## a valid indexing vector. It is important to note that
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25 ## @code{subsindex} must return a zero-based real integer vector of the
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26 ## class @qcode{"double"}. For example, if the class constructor
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27 ##
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28 ## @example
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29 ## @group
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30 ## function b = myclass (a)
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31 ## b = class (struct ("a", a), "myclass");
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32 ## endfunction
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33 ## @end group
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34 ## @end example
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35 ##
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36 ## @noindent
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37 ## then the @code{subsindex} function
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38 ##
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39 ## @example
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40 ## @group
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41 ## function idx = subsindex (a)
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42 ## idx = double (a.a) - 1.0;
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43 ## endfunction
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44 ## @end group
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45 ## @end example
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46 ##
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47 ## @noindent
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48 ## can then be used as follows
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49 ##
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50 ## @example
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51 ## @group
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52 ## a = myclass (1:4);
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53 ## b = 1:10;
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54 ## b(a)
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55 ## @result{} 1 2 3 4
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56 ## @end group
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57 ## @end example
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58 ##
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59 ## @seealso{class, subsref, subsasgn}
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60 ## @end deftypefn
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61
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62 function idx = subsindex (a)
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63 error ("subsindex: not defined for class \"%s\"", class (a));
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64 endfunction
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65