Mercurial > hg > octave-lojdl
changeset 3133:812645c63072
[project @ 1998-01-30 21:23:00 by jwe]
betai.m
author | jwe |
---|---|
date | Fri, 30 Jan 1998 21:23:00 +0000 |
parents | 338335dd1033 |
children | 8bf70ba446d0 |
files | scripts/specfun/gammai.m |
diffstat | 1 files changed, 43 insertions(+), 0 deletions(-) [+] |
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new file mode 100644 --- /dev/null +++ b/scripts/specfun/gammai.m @@ -0,0 +1,43 @@ +## Copyright (C) 1998 John W. Eaton +## +## 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. + +## usage: gammai (a, x) +## +## Compute the incomplete gamma function +## +## gammai (a, x) = (\int_0^x exp(-t) t^(a-1) dt) / gamma(a). +## +## If a is scalar, then gammai (a, x) is returned for each element of x +## and vice versa. +## +## If neither a nor x is scalar, the sizes of a and x must agree, and +## gammainc is applied for corresponding elements of x and a. + +## Author: jwe +## Created: 30 Jan 1998 + +function retval = gammai (a, x) + + if (nargin == 2) + retval = gammainc (x, a); + else + usage ("gammai (a, x)"); + endif + +endfunction