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annotate scripts/general/runlength.m @ 11188:4cb1522e4d0f

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Use function handle as input to cellfun, rather than quoted function name or anonymous function wrapper.
author Rik <octave@nomad.inbox5.com>
date Wed, 03 Nov 2010 17:20:56 -0700
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children fd0a3ac60b0e
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2005, 2008, 2009 Paul Kienzle
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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} {} runlength (@var{x})
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21 ## Find the lengths of all sequences of common values. Return the
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22 ## vector of lengths and the value that was repeated.
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23 ##
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24 ## @example
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25 ## @group
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26 ## runlength ([2, 2, 0, 4, 4, 4, 0, 1, 1, 1, 1])
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27 ## @result{} [2, 1, 3, 1, 4]
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28 ## @end group
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29 ## @end example
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30 ## @end deftypefn
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31
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32 function [count, value] = runlength (x)
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33 idx = [find(x(1:end-1) != x(2:end)), length(x)];
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34 value = x(idx);
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35 count = diff ([0 idx]);
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36 endfunction
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37
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38 %!assert (runlength([2 2 0 4 4 4 0 1 1 1 1]), [2 1 3 1 4]);