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Re: Rearrange equation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg111586] Re: Rearrange equation
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 6 Aug 2010 06:57:50 -0400 (EDT)

I believe that you will have to use numeric techniques

Manipulate[
 FindRoot[
   G == (Erfc[x]*(\[Mu] - Log[x]))/(2*Sqrt[2]*\[Sigma]),
   {x, 1}] // Chop,
 {{\[Mu], 0}, 0, 2.25, Appearance -> "Labeled"},
 {{\[Sigma], 1}, .1, 5, Appearance -> "Labeled"},
 {{G, 0}, 0, 4, Appearance -> "Labeled"}]


Bob Hanlon

---- Tonja Krueger <tonja.krueger at web.de> wrote: 

=============
I want to rearrange the equation below so that it would look like:
x-> ....
I tried:
Solve[G==-(Sqrt[\[Pi]/2]*Erfc[x]*(-\[Mu]+Log[x]))/(2*Sqrt[\[Pi]]*\[Sigma]),x]
But then I got the error message:
Solve::tdep: The equations appear to involve the variables to be  solved for in an essentially non-algebraic way.
Is there a way to solve the equation?
Thanks Tonja




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