Mercurial > octave-nkf
view scripts/statistics/distributions/stdnormal_pdf.m @ 20641:c3c052b9192a
Improve performance and error reporting of betainv, gaminv (bug #34363).
* betainv.m: Replace for loop with do-until loop. Shorten max loop cycles to
40, rather than 10,000. Issue warning if algorithm fails.
* gaminv.m: Replace for loop with do-until loop. Shorten max loop cycles to
40, rather than 100. Issue warning if algorithm fails.
author | Rik <rik@octave.org> |
---|---|
date | Sun, 11 Oct 2015 16:55:17 -0700 |
parents | d9341b422488 |
children |
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## Copyright (C) 2012 Rik Wehbring ## 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} {} stdnormal_pdf (@var{x}) ## For each element of @var{x}, compute the probability density function (PDF) ## at @var{x} of the standard normal distribution ## (mean = 0, standard deviation = 1). ## @end deftypefn ## Author: TT <Teresa.Twaroch@ci.tuwien.ac.at> ## Description: PDF of the standard normal distribution function pdf = stdnormal_pdf (x) if (nargin != 1) print_usage (); endif if (iscomplex (x)) error ("stdnormal_pdf: X must not be complex"); endif pdf = (2 * pi)^(- 1/2) * exp (- x .^ 2 / 2); endfunction %!shared x,y %! x = [-Inf 0 1 Inf]; %! y = 1/sqrt(2*pi)*exp (-x.^2/2); %!assert (stdnormal_pdf ([x, NaN]), [y, NaN], eps) ## Test class of input preserved %!assert (stdnormal_pdf (single ([x, NaN])), single ([y, NaN]), eps ("single")) ## Test input validation %!error stdnormal_pdf () %!error stdnormal_pdf (1,2) %!error stdnormal_pdf (i)