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MathGroup Archive 2005

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Re: Problem with evaluation of Besel Functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55992] Re: Problem with evaluation of Besel Functions
  • From: Peter Pein <petsie at arcor.de>
  • Date: Wed, 13 Apr 2005 01:10:19 -0400 (EDT)
  • References: <d3g8kd$smh$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Ariel sumeruk wrote:
> Hello
> I am having a problem evaluating various functions, One example is the following
> 
> BesselJ[1.5, 0] evaluates to 0
I guess Mathematica has this coded as special case
(BesselJ[n_/;n!=0,0]:=0), as BesselJ[3/2,z] evaluates to
(Sqrt[2/Pi]*(-Cos[z] + Sin[z]/z))/Sqrt[z]. And BesselJ[3/2,z]/.z->0
gives (of course) Indeterminate.
> but
> (BesselJ[xx, yyy] /. xx -> 1.5) /. yyy -> 0 evaluates to complex infinity
> 
> I seem to encounter many of these problems with Bessel and Legendre
> functions where I get actual diffrent numerical results depending on
> How I set the parameters.
> Thanks for anyone who might help
> Ariel
> 


-- 
Peter Pein
Berlin


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