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MathGroup Archive 1997

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Re: Re: Help with findroot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg9228] Re: [mg9182] Re: [mg9169] Help with findroot
  • From: Hugh Walker <hwalker at hypercon.com>
  • Date: Fri, 24 Oct 1997 01:00:42 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

I have an error in my posting on this subject. Plesae note the
correction below.


I suggest you try the following approach. First, rescale your function
so that
                            x/1.2 10^(-4) -> z Then find the solutions
of Sqrt[z] == -0.01 Tan[Sqrt[z]]. But the solutions of this equation
are the same as the solutions of

         *****    Sqrt[z] Cos[Sqrt[z]] == -0.01 Sin[Sqrt[z]] *****

This problem has none of the difficulties encountered in the previous
formulation.

Hugh Walker
Gnarly Oaks
Phone: (713) 729-3093



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