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MathGroup Archive 2002

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Re: Problem with hypergeometric function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg34824] Re: Problem with hypergeometric function
  • From: phbrf at t-online.de (Peter Breitfeld)
  • Date: Sat, 8 Jun 2002 05:21:45 -0400 (EDT)
  • References: <adpfj2$j4c$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Ignacio Rodriguez schrieb:
> $Version
> 
> Microsoft Windows 3.0 (April 25, 1997)
> 
> Hi all,
> I have noticed some problems when trying to evaluate numerically certain 
> hypergeometric functions.
> For example:
> 
> f=HypergeometricPFQ[{1/2},{1,3/2},-8000]
> 
> N[f]
> 
> -1.34969 x 10^57
> 
> a bit big, isn't it?
> 
> $MaxExtraPrecision=200
> N[N[f,30]]
> 
> 0.00586605
>
This Result is shown with Mathematica 4.1 (Linux) using N[f], without
setting $MaxExtraPrecision.

Gruß Peter
-- 
=--=--=--=--=--=--=--=--=--=--=--=--=--= http://home.t-online.de/home/phbrf
 Peter Breitfeld, Bad Saulgau, Germany   Meinen GnuPG/PGP-5x Key gibts dort



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