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[project @ 1998-10-23 05:43:59 by jwe]
author jwe
date Fri, 23 Oct 1998 05:44:01 +0000
parents
children f8dde1807dee
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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify
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4 ## it under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 2, or (at your option)
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6 ## any later version.
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7 ##
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8 ## This program is distributed in the hope that it will be useful, but
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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11 ## General Public License for more details.
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12 ##
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13 ## You should have received a copy of the GNU General Public License
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14 ## along with this file. If not, write to the Free Software Foundation,
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15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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16
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17 ## usage: uniform_pdf (x [, a, b])
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18 ##
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19 ## For each element of x, compute the PDF at x of the uniform
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20 ## distribution on [a, b].
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21 ##
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22 ## Default values are a = 0, b = 1.
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23
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24 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
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25 ## Description: PDF of the uniform distribution
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26
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27 function pdf = uniform_pdf (x, a, b)
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28
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29 if !(nargin == 1 || nargin == 3)
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30 usage ("uniform_pdf (x [, a, b])");
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31 endif
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32
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33 if (nargin == 1)
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34 a = 0;
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35 b = 1;
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36 endif
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37
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38 [retval, x, a, b] = common_size (x, a, b);
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39 if (retval > 0)
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40 error (["uniform_pdf: ", ...
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41 "x, a and b must be of common size or scalars"]);
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42 endif
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43
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44 [r, c] = size (x);
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45 s = r * c;
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46 x = reshape (x, 1, s);
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47 a = reshape (a, 1, s);
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48 b = reshape (b, 1, s);
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49 pdf = zeros (1, s);
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50
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51 k = find (isnan (x) | !(a < b));
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52 if any (k)
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53 pdf(k) = NaN * ones (1, length (k));
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54 endif
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55
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56 k = find ((x > a) & (x < b));
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57 if any (k)
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58 pdf(k) = 1 ./ (b(k) - a(k));
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59 endif
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60
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61 pdf = reshape (pdf, r, c);
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62
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63 endfunction