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1 ## Copyright (C) 2005, 2008 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 ## runlength ([2, 2, 0, 4, 4, 4, 0, 1, 1, 1, 1]) |
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26 ## @result{} [2, 1, 3, 1, 4] |
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27 ## @end example |
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28 ## @end deftypefn |
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29 |
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30 function [count, value] = runlength (x) |
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31 idx = [find(x(1:end-1) != x(2:end)), length(x)]; |
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32 value = x(idx); |
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33 count = diff ([0 idx]); |
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34 endfunction |
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35 |
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36 %!assert (runlength([2 2 0 4 4 4 0 1 1 1 1]), [2 1 3 1 4]); |
