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annotate scripts/statistics/base/ranks.m @ 3922:38c61cbf086c

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[project @ 2002-05-01 06:48:35 by jwe]
author jwe
date Wed, 01 May 2002 06:48:36 +0000
parents e031284eea27
children 28ab079d8f0e
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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik
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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 2, or (at your option)
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8 ## 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, write to the Free
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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18 ## 02111-1307, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} ranks (@var{x})
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22 ## If @var{x} is a vector, return the (column) vector of ranks of
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23 ## @var{x} adjusted for ties.
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24 ##
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25 ## If @var{x} is a matrix, do the above for each column of @var{x}.
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26 ## @end deftypefn
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28 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
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29 ## Description: Compute ranks
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31 ## This code is rather ugly, but is there an easy way to get the ranks
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32 ## adjusted for ties from sort?
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33
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34 function y = ranks (x)
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35
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36 if (nargin != 1)
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37 usage ("ranks (x)");
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38 endif
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39
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40 y = [];
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41
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42 [r, c] = size (x);
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43 if ((r == 1) && (c > 0))
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44 p = x' * ones (1, c);
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45 y = sum (p < p') + (sum (p == p') + 1) / 2;
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46 elseif (r > 1)
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47 o = ones (1, r);
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48 for i = 1 : c;
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49 p = x (:, i) * o;
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50 y = [y, (sum (p < p') + (sum (p == p') + 1) / 2)'];
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51 endfor
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52 endif
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53
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54 endfunction