MathGroup Archive: June 2002 [00292]

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Re: Problem with hypergeometric function

To: mathgroup at smc.vnet.net
Subject: [mg34982] Re: Problem with hypergeometric function
From: "HPhreacker$tm$" <coerce at brasnet.org>
Date: Mon, 17 Jun 2002 03:27:02 -0400 (EDT)
References: <adpfj2$j4c$1@smc.vnet.net>
Sender: owner-wri-mathgroup at wolfram.com

"Ignacio Rodriguez" <ignacio at sgirmn.pluri.ucm.es> escreveu na mensagem
news:adpfj2$j4c$1 at smc.vnet.net...
> $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

$Version
"4.0 for Microsoft Windows (April 21, 1999)"
N[f]
0.00586605

Works in Mathematica 4!!

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