Mercurial > octave
view scripts/statistics/distributions/logistic_rnd.m @ 23084:ef4d915df748
maint: Merge stable to default.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 23 Jan 2017 14:27:48 -0500 |
parents | 3a2b891d0b33 e9a0469dedd9 |
children | 194eb4bd202b |
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## Copyright (C) 2012 Rik Wehbring ## Copyright (C) 1995-2016 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 {} {} logistic_rnd (@var{r}) ## @deftypefnx {} {} logistic_rnd (@var{r}, @var{c}, @dots{}) ## @deftypefnx {} {} logistic_rnd ([@var{sz}]) ## Return a matrix of random samples from the logistic distribution. ## ## When called with a single size argument, return a square matrix with ## the dimension specified. When called with more than one scalar argument the ## first two arguments are taken as the number of rows and columns and any ## further arguments specify additional matrix dimensions. The size may also ## be specified with a vector of dimensions @var{sz}. ## @end deftypefn ## Author: KH <Kurt.Hornik@wu-wien.ac.at> ## Description: Random deviates from the logistic distribution function rnd = logistic_rnd (varargin) if (nargin < 1) print_usage (); endif if (nargin == 1) if (isscalar (varargin{1}) && varargin{1} >= 0) sz = [varargin{1}, varargin{1}]; elseif (isrow (varargin{1}) && all (varargin{1} >= 0)) sz = varargin{1}; else error ("logistic_rnd: dimension vector must be row vector of non-negative integers"); endif elseif (nargin > 1) if (any (cellfun (@(x) (! isscalar (x) || x < 0), varargin))) error ("logistic_rnd: dimensions must be non-negative integers"); endif sz = [varargin{:}]; endif rnd = - log (1 ./ rand (sz) - 1); endfunction %!assert (size (logistic_rnd (3)), [3, 3]) %!assert (size (logistic_rnd ([4 1])), [4, 1]) %!assert (size (logistic_rnd (4,1)), [4, 1]) ## Test input validation %!error logistic_rnd () %!error logistic_rnd (-1) %!error logistic_rnd (ones (2)) %!error logistic_rnd ([2 -1 2]) %!error logistic_rnd (1, ones (2)) %!error logistic_rnd (1, -1)