Mercurial > octave-nkf
view scripts/statistics/distributions/chisquare_pdf.m @ 3922:38c61cbf086c
[project @ 2002-05-01 06:48:35 by jwe]
author | jwe |
---|---|
date | Wed, 01 May 2002 06:48:36 +0000 |
parents | 74c2fc84f0cf |
children | 4b0f3b055331 |
line wrap: on
line source
## Copyright (C) 1995, 1996, 1997 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 2, 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, write to the Free ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA ## 02111-1307, USA. ## -*- texinfo -*- ## @deftypefn {Function File} {} chisquare_pdf (@var{x}, @var{n}) ## For each element of @var{x}, compute the probability density function ## (PDF) at @var{x} of the chisquare distribution with @var{k} degrees ## of freedom. ## @end deftypefn ## Author: TT <Teresa.Twaroch@ci.tuwien.ac.at> ## Description: PDF of the chi-sqaure distribution function pdf = chisquare_pdf (x, n) if (nargin != 2) usage ("chisquare_pdf (x, n)"); endif [retval, x, n] = common_size (x, n); if (retval > 0) error ("chisquare_pdf: x and n must be of common size or scalar"); endif pdf = gamma_pdf (x, n / 2, 1 / 2); endfunction