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1 ## Copyright (C) 2000, 2005, 2007 Daniel Calvelo |
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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} {} sortrows (@var{a}, @var{c}) |
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21 ## Sort the rows of the matrix @var{a} according to the order of the |
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22 ## columns specified in @var{c}. If @var{c} is omitted, a |
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23 ## lexicographical sort is used. |
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24 ## @end deftypefn |
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25 |
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26 ## Author: Daniel Calvelo, Paul Kienzle |
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27 ## Adapted-by: jwe |
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28 |
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29 function [s, i] = sortrows (m, c) |
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30 |
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31 if (nargin < 2) |
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32 indices = [1:size(m,2)]'; |
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33 else |
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34 indices = c(:); |
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35 endif |
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36 |
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37 if (ischar (m)) |
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38 s = toascii (m); |
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39 else |
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40 s = m; |
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41 endif |
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42 |
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43 ## Since sort is 'stable' the order of identical elements will be |
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44 ## preserved, so by traversing the sort indices in reverse order we |
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45 ## will make sure that identical elements in index i are subsorted by |
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46 ## index j. |
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47 indices = flipud (indices); |
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48 i = [1:size(m,1)]'; |
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49 for ii = 1:length (indices); |
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50 [trash, idx] = sort (s(:,indices(ii))); |
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51 s = s(idx,:); |
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52 i = i(idx); |
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53 endfor |
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54 |
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55 if (ischar (m)) |
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56 s = char (s); |
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57 endif |
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58 |
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59 endfunction |
