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About FindRoot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92501] About FindRoot
  • From: "Ary Adilson Morales Alvarado" <amorales at lme.usp.br>
  • Date: Wed, 1 Oct 2008 18:36:10 -0400 (EDT)

Dear friends,

When I use the FindRoot the Mathematica shows me this error:
FindRoot::"jsing" "Encountered a singular Jacobian at
      the point ({n22i\_3}\) = \!\({0.1`}\). Try perturbing the initial \
point(s"\)

I changed the initial value, but I get the same result.

Part of the code is that:

\!\(\(For[
    i = 1, i < q + 1, FindRoot[\(Ai\_i*Exp[\(4*&#960;*
      k2i\_i*dimpar\)\/&#955;impar\_i]\)\/\(Bi\_i*Exp[2*\(4*&#960;*k2i\_i*dimpar\)\/\
&#955;impar\_i] + Ci\_i*Exp[\(4*&#960;*k2i\_i*dimpar\)\/&#955;impar\_i] +
Di\_i\) - \
Timpar\_i == 0, {n22i\_i, 0.1}]; \(i++\)];\)\)


I'm using Mathematica 5.2

Can you give me some help?

Thanks in advanced.

Ary



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