Mercurial > octave-nkf
annotate scripts/statistics/distributions/logistic_cdf.m @ 20643:d6d04088ac9e
nbininv.m: Increase speed (85X) and accuracy of function (bug #34363).
* nbininv.m: Call new function scalar_nbininv to calculate nbininv for scalar.
If there are still uncalculated values then call bin_search_nbininv. Call
bin_search_nbininv directly for vectors. Add more BIST tests.
* nbininv.m (scalar_binoinv): New subfunction to calculate nbininv for scalar x.
Stops when x > 1000.
* nbininv.m (bin_search_nbininv): New subfunction to do binary search for nbininv.
author | Lachlan Andrew <lachlanbis@gmail.com> |
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date | Sun, 11 Oct 2015 20:33:37 -0700 |
parents | 9fc020886ae9 |
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rev | line source |
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1 ## Copyright (C) 2012 Rik Wehbring |
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2 ## Copyright (C) 1995-2015 Kurt Hornik |
3426 | 3 ## |
3922 | 4 ## This file is part of Octave. |
5 ## | |
6 ## Octave is free software; you can redistribute it and/or modify it | |
7 ## under the terms of the GNU General Public License as published by | |
7016 | 8 ## the Free Software Foundation; either version 3 of the License, or (at |
9 ## your option) any later version. | |
3426 | 10 ## |
3922 | 11 ## Octave is distributed in the hope that it will be useful, but |
3191 | 12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3426 | 14 ## General Public License for more details. |
15 ## | |
3191 | 16 ## You should have received a copy of the GNU General Public License |
7016 | 17 ## along with Octave; see the file COPYING. If not, see |
18 ## <http://www.gnu.org/licenses/>. | |
3191 | 19 |
3456 | 20 ## -*- texinfo -*- |
21 ## @deftypefn {Function File} {} logistic_cdf (@var{x}) | |
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22 ## For each element of @var{x}, compute the cumulative distribution function |
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23 ## (CDF) at @var{x} of the logistic distribution. |
3456 | 24 ## @end deftypefn |
3426 | 25 |
5428 | 26 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
3456 | 27 ## Description: CDF of the logistic distribution |
3191 | 28 |
29 function cdf = logistic_cdf (x) | |
3426 | 30 |
3191 | 31 if (nargin != 1) |
6046 | 32 print_usage (); |
3191 | 33 endif |
34 | |
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35 if (iscomplex (x)) |
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36 error ("logistic_cdf: X must not be complex"); |
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37 endif |
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38 |
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39 cdf = 1 ./ (1 + exp (-x)); |
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(3) 0 log(3) Inf]; |
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46 %! y = [0, 1/4, 1/2, 3/4, 1]; |
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47 %!assert (logistic_cdf ([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_cdf (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_cdf () |
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54 %!error logistic_cdf (1,2) |
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55 %!error logistic_cdf (i) |
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56 |