Mercurial > octave-nkf
view scripts/statistics/distributions/logistic_pdf.m @ 20642:9d2023d1a63c
binoinv.m: Implement binary search algorithm for 28X performance increase (bug #34363).
* binoinv.m: Call new functions scalar_binoinv or vector_binoinv to calculate
binoinv. If there are still uncalculated values then call bin_search_binoinv
to perform binary search for remaining values. Add more BIST tests.
* binoinv.m (scalar_binoinv): New subfunction to calculate binoinv for scalar x.
Stops when x > 1000.
* binoinv.m (vector_binoinv): New subfunction to calculate binoinv for scalar x.
Stops when x > 1000.
author | Lachlan Andrew <lachlanbis@gmail.com> |
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date | Sun, 11 Oct 2015 19:49:40 -0700 |
parents | 9fc020886ae9 |
children |
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## Copyright (C) 1995-2015 Kurt Hornik ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 3 of the License, or (at ## your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} logistic_pdf (@var{x}) ## For each element of @var{x}, compute the PDF at @var{x} of the ## logistic distribution. ## @end deftypefn ## Author: KH <Kurt.Hornik@wu-wien.ac.at> ## Description: PDF of the logistic distribution function pdf = logistic_pdf (x) if (nargin != 1) print_usage (); endif if (iscomplex (x)) error ("logistic_pdf: X must not be complex"); endif cdf = logistic_cdf (x); pdf = cdf .* (1 - cdf); endfunction %!shared x,y %! x = [-Inf -log(4) 0 log(4) Inf]; %! y = [0, 0.16, 1/4, 0.16, 0]; %!assert (logistic_pdf ([x, NaN]), [y, NaN], eps) ## Test class of input preserved %!assert (logistic_pdf (single ([x, NaN])), single ([y, NaN]), eps ("single")) ## Test input validation %!error logistic_pdf () %!error logistic_pdf (1,2) %!error logistic_pdf (i)