Mercurial > octave-nkf
annotate scripts/statistics/distributions/logistic_pdf.m @ 14138:72c96de7a403 stable
maint: update copyright notices for 2012
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 02 Jan 2012 14:25:41 -0500 |
parents | 19b9f17d22af |
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maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1995-2012 Kurt Hornik |
3426 | 2 ## |
3922 | 3 ## This file is part of Octave. |
4 ## | |
5 ## Octave is free software; you can redistribute it and/or modify it | |
6 ## under the terms of the GNU General Public License as published by | |
7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
8 ## your option) any later version. | |
3426 | 9 ## |
3922 | 10 ## Octave is distributed in the hope that it will be useful, but |
3191 | 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3426 | 13 ## General Public License for more details. |
14 ## | |
3191 | 15 ## You should have received a copy of the GNU General Public License |
7016 | 16 ## along with Octave; see the file COPYING. If not, see |
17 ## <http://www.gnu.org/licenses/>. | |
3191 | 18 |
3456 | 19 ## -*- texinfo -*- |
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 |
3456 | 22 ## logistic distribution. |
23 ## @end deftypefn | |
3191 | 24 |
5428 | 25 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
3456 | 26 ## Description: PDF of the logistic distribution |
3191 | 27 |
28 function pdf = logistic_pdf (x) | |
3426 | 29 |
3191 | 30 if (nargin != 1) |
6046 | 31 print_usage (); |
3191 | 32 endif |
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 |
3191 | 38 cdf = logistic_cdf (x); |
39 pdf = cdf .* (1 - cdf); | |
3426 | 40 |
3191 | 41 endfunction |
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42 |
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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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56 |