The incomplete gamma function

2 messages · Kjetil Kjernsmo, Brian Ripley

Fri, May 12, 2000 11:40 AM #

Hello again!

Since my previous question wasn't stupid, I try another one:

Has anybody implemented the _incomplete_ gamma function in R?

After looking at the code for the Euler gamma function, it doesn't look
very easy.... But I don't think I need anything very rigorous or accurate
or fast, so I was hoping someone might have something. 

Best,

Kjetil

Kjetil Kjernsmo
Graduate astronomy-student                    Problems worthy of attack
University of Oslo, Norway            Prove their worth by hitting back
E-mail: kjetikj at astro.uio.no                                - Piet Hein
Homepage <URL:http://www.astro.uio.no/~kjetikj/>
Webmaster at skepsis.no 

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Brian Ripley

Fri, May 12, 2000 12:33 PM #

On Fri, 12 May 2000, Kjetil Kjernsmo wrote:

What do you think the cumulative distribution function of a gamma
distribution is?  (Now, there is a little room for disagreement here,
but I think

pgamma(x, nu)*gamma(nu)

might be what you are looking for.)

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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