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annotate scripts/statistics/base/studentize.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 d25bc039237b
children 22bd65326ec1
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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} {} studentize (@var{x})
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22 ## If @var{x} is a vector, subtract its mean and divide by its standard
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23 ## deviation.
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24 ##
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25 ## If @var{x} is a matrix, do the above for each column.
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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: Subtract mean and divide by standard deviation
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31 function t = studentize (x)
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32
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33 if (nargin != 1)
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34 usage ("studentize (x)");
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35 endif
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37 if is_vector (x)
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38 if (std (x) == 0)
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39 t = zeros (size (x));
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40 else
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41 t = (x - mean (x)) / std (x);
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42 endif
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43 elseif is_matrix (x)
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44 l = ones (rows (x), 1);
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45 t = x - l * mean (x);
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46 t = t ./ (l * max ([(std (t)); (! any (t))]));
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47 else
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48 error ("studentize: x must be a vector or a matrix");
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49 endif
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50
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51 endfunction