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annotate scripts/statistics/distributions/logistic_pdf.m @ 17173:bb60b1bb47cf

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view.m: Fix args undefined error when calling with two arguments
author Max Brister <max@2bass.com>
date Sat, 03 Aug 2013 17:23:44 -0600
parents f3d52523cde1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1995-2012 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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} logistic_pdf (@var{x})
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21 ## For each element of @var{x}, compute the PDF at @var{x} of the
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22 ## logistic distribution.
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23 ## @end deftypefn
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24
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25 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
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26 ## Description: PDF of the logistic distribution
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27
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28 function pdf = logistic_pdf (x)
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29
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30 if (nargin != 1)
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31 print_usage ();
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32 endif
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33
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34 if (iscomplex (x))
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35 error ("logistic_pdf: X must not be complex");
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36 endif
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37
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38 cdf = logistic_cdf (x);
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39 pdf = cdf .* (1 - cdf);
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40
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41 endfunction
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43
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44 %!shared x,y
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45 %! x = [-Inf -log(4) 0 log(4) Inf];
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46 %! y = [0, 0.16, 1/4, 0.16, 0];
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47 %!assert (logistic_pdf ([x, NaN]), [y, NaN], eps)
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48
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49 %% Test class of input preserved
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50 %!assert (logistic_pdf (single ([x, NaN])), single ([y, NaN]), eps ("single"))
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51
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52 %% Test input validation
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53 %!error logistic_pdf ()
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54 %!error logistic_pdf (1,2)
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55 %!error logistic_pdf (i)
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