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MathGroup Archive 1997

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Help with findroot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg9169] Help with findroot
  • From: darrmis at aol.com (Darrmis)
  • Date: Thu, 16 Oct 1997 03:38:08 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

I'm having a problem using findroot to solve an equation.  Perhaps
someone
 could shed some light on what's wrong.

FindRoot[Sqrt[x/(1.2 10^ -4)]==-0.1*Tan[Sqrt[x/(1.2*10^
-4)]],{x,0.1,0.1,2}]

Mathematica 3. returns a value of -0.07 for x which is not anywhere
close to correct. 
 Further, I've tried several different starting values and min/max
limits, but
 a negative answer is always returned.  Eventually I'de like to compile
a list
 of all the roots of the equation up to, say, x=1000, but I can't even
get one
 right now.

Thanks,

Karl Kevala


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