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[project @ 2005-04-26 19:24:27 by jwe]
author jwe
date Tue, 26 Apr 2005 19:24:47 +0000
parents 4b0f3b055331
children
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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} uniform_pdf (@var{x}, @var{a}, @var{b})
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22 ## For each element of @var{x}, compute the PDF at @var{x} of the uniform
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23 ## distribution on [@var{a}, @var{b}].
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24 ##
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25 ## Default values are @var{a} = 0, @var{b} = 1.
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26 ## @end deftypefn
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27
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28 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
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29 ## Description: PDF of the uniform distribution
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30
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31 function pdf = uniform_pdf (x, a, b)
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32
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33 if (nargin != 1 && nargin != 3)
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34 usage ("uniform_pdf (x, a, b)");
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35 endif
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36
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37 if (nargin == 1)
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38 a = 0;
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39 b = 1;
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40 endif
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41
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42 if (!isscalar (a) || !isscalar(b))
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43 [retval, x, a, b] = common_size (x, a, b);
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44 if (retval > 0)
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45 error ("uniform_pdf: x, a and b must be of common size or scalars");
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46 endif
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47 endif
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48
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49 sz = size (x);
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50 pdf = zeros (sz);
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51
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52 k = find (isnan (x) | !(a < b));
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53 if (any (k))
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54 pdf(k) = NaN;
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55 endif
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56
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57 k = find ((x > a) & (x < b));
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58 if (any (k))
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59 if (isscalar (a) && isscalar(b))
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60 pdf(k) = 1 ./ (b - a);
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61 else
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62 pdf(k) = 1 ./ (b(k) - a(k));
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63 endif
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64 endif
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65
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66 endfunction