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Re: StruveH runtime error

• To: mathgroup at smc.vnet.net
• Subject: [mg45721] Re: StruveH runtime error
• From: Paul Abbott <paul at physics.uwa.edu.au>
• Date: Wed, 21 Jan 2004 04:55:04 -0500 (EST)
• Organization: The University of Western Australia
• References: <buap11$mim$1@smc.vnet.net> <bugb60$gme$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

In article <bugb60$gme$1 at smc.vnet.net>,
 "Alan" <infoNOSPAM at optioncity.net> wrote:

> > I am having troubles in evaluating StruveH functions.
> >
> > StruveH[1,10^4]=0.643716
> > took 278356 sec on P4, 2.8GHz (HDD 120GB, 1024MB PC3200 RAM) Win XP SP1
> > machine with Mathematica v.5.0.
> > It took really long time. But the value could be evaluated.
> >
> > However,
> > StruveH[1,10^5]
> > could not be evaluated, because the session was terminated with a Windows
> > error message
> 
> Abramowitz & Stegun says:
> 
> StruveH[1, z] ~  BesselY[1,z] + (2/Pi)(1 + 1/z^2 - 3/z^4 + 45/z^6 +
> O(1/z^8))

I am suprised that I cannot find this asymptotic series representation at

  http://functions.wolfram.com/BesselAiryStruveFunctions/StruveH

Cheers,
Paul

-- 
Paul Abbott                                   Phone: +61 8 9380 2734
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