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MathGroup Archive 2005

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Re: bug in series expansion routines.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55255] Re: bug in series expansion routines.
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Thu, 17 Mar 2005 03:30:47 -0500 (EST)
  • Organization: The University of Western Australia
  • References: <d193sk$nnb$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <d193sk$nnb$1 at smc.vnet.net>,
 Richard Fateman <fateman at cs.berkeley.edu> wrote:

> Series[BesselJ[0, x], {x, 2.404, 10}]
> 
> gives an error about illegal series composition, which
> is inappropriate, since using 2404/1000 in there
> produces a series.
> 
> My guess is that this bug could be exhibited in
> many ways.
> version 5.0

No error in version 5.1.  Also, since it appears that are expanding 
BesselJ[0, x] about its first zero, j0, perhaps

  Simplify[Series[BesselJ[0, x]/BesselJ[1, j0], {x, j0, 5}] /. 
    BesselJ[0, j0] -> 0]

is more useful.

Cheers,
Paul

-- 
Paul Abbott                                   Phone: +61 8 6488 2734
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