If you just need some code that computes the gamma (or log-gamma) function,
and not necessarily reproduce exactly what Splus does, you can find such
info on Guide to Available Mathematical Software (GAMS):
http://gams.nist.gov/serve.cgi/ClassIndex?Key=gamma
If you want the algorithm, I'd imagine the classic Abramowitz & Stegun (now
available online at http://www.math.sfu.ca/~cbm/aands/) would have it.
HTH,
Andy
> From: Christoph Scherber
>
> Hi!
>
> Can anyone tell me how S-Plus calculates the gamma function?
> I would like to
> write a gamma function for Delphi and would need the exact
> way in which this
> function is calculated.
>
> Specifically, I need to calculate the factorial of
> non-integer values (such as
> 0.5; 0.3 etc).
>
> Thanks very much for your help!
> Chris
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