From ripley@stats.ox.ac.uk  Fri Jul 26 08:02:53 2002
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Fri, 26 Jul 2002 09:02:53 +0200 (MET DST)
Subject: src/nmath/pgeom.c (PR#1834)
Message-ID: <200207260702.JAA22151@pubhealth.ku.dk>

On Thu, 25 Jul 2002 terra@diku.dk wrote:

> Full_Name: Morten Welinder
> Version: 1.5.1
> OS: Solaris/Linux
> Submission from: (NULL) (192.5.35.38)
>
>
> The line
>
>     return log(1 - p) * (x + 1);
>
> looks like it has problems for p near 1.  I would suggest rewriting it to

Could you give us an example of the problems please?  Otherwise how
will we know that we have solved them?

>     return log1p (-p) * (x + 1);

Please report the bug (see BUGS in the FAQ) and not the solution.  It
seems to me to be working fine for p as small as 10^(-8) which is already
way beyond a feasible application of a geometric (as an exponential would
be used instead).

-- 
Brian D. Ripley,                  ripley@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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src/nmath/pgeom.c (PR#1834)
ripley@stats.ox.ac.uk