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MathGroup Archive 1998

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Re: Possible bug in FindRoot[] in Mathematica 3.0


  • To: mathgroup@smc.vnet.net
  • Subject: [mg11184] Re: Possible bug in FindRoot[] in Mathematica 3.0
  • From: Bill Bertram <wkb@ansto.gov.au>
  • Date: Wed, 25 Feb 1998 03:31:53 -0500
  • Organization: ANSTO
  • References: <6ctg2d$lk5@smc.vnet.net>

Adrian Cable wrote:
> 
> Hi there,
> I think I've possibly found a bug in Mathematica 3.0. Consider the
> equation:

> This looks like a bug to me. Or am I just missing something here?
> 
 Yes you are missing something, namely that the root you
 get depends on your initial guess. With your initial value of
 x = 0, Mathematica tries to converge on the "root" at x -> -Infinity.
 (which also satisfies your equation). You can get the other root by
 telling Mathematica to start at some x > 0 eg {x,0.5}

 Cheers ,
     Bill



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