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annotate scripts/statistics/base/center.m @ 8977:f464119ec165

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further simplify some stats funcs
author Jaroslav Hajek <highegg@gmail.com>
date Fri, 13 Mar 2009 21:26:13 +0100
parents eb63fbe60fab
children fb3543975ed9
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1 ## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2004, 2005, 2006,
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John W. Eaton <jwe@octave.org>
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2 ## 2007, 2009 Kurt Hornik
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} center (@var{x})
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22 ## @deftypefnx {Function File} {} center (@var{x}, @var{dim})
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23 ## If @var{x} is a vector, subtract its mean.
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24 ## If @var{x} is a matrix, do the above for each column.
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25 ## If the optional argument @var{dim} is given, perform the above
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26 ## operation along this dimension
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27 ## @end deftypefn
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28
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29 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
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30 ## Description: Center by subtracting means
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31
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32 function retval = center (x, dim)
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33
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34 if (nargin != 1 && nargin != 2)
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35 print_usage ();
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36 endif
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37
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38 if (nargin < 2)
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39 t = find (size (x) != 1);
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40 if (isempty (t))
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41 dim = 1;
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42 else
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43 dim = t(1);
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44 endif
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45 endif
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46 n = size (x, dim);
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47
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48 if (n == 1)
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49 retval = zeros (size (x));
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50 elseif (n > 0)
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51 if (isvector (x))
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52 retval = x - sum (x) / n;
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53 else
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54 mx = sum (x, dim) / n;
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55 idx(1:ndims (x)) = {':'};
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56 idx{dim} = ones (1, n);
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57 retval = x - mx(idx{:});
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58 endif
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59 else
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60 retval = x;
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61 endif
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62 endfunction