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RE: FindRoot, with Catch and Throw?

  • To: mathgroup at
  • Subject: [mg33246] RE: [mg33238] FindRoot, with Catch and Throw?
  • From: "David Park" <djmp at>
  • Date: Tue, 12 Mar 2002 05:08:29 -0500 (EST)
  • Sender: owner-wri-mathgroup at


Ted Ersek has a RootSearch package on MathSource that might help.

In general, my belief is, if you are having trouble finding a root to an
equation, rather than just throwing brute force at it, you should see if you
can perform transformations on the function, by change of variables, that
will more cleanly isolate the roots and the regions of search.

David Park
djmp at

> From: bradamanteus at [mailto:bradamanteus at]
To: mathgroup at
> My FindRoot usually fails in finding the root. The only thing
> that works is
> if I change the starting values. I want to use the failed
> approximation that
> results from a failed FindRoot expression and substitute this into one of
> the starting values and then run FindRoot again. How can I
> automate this. Do
> I use Catch and Throw ? If so how?
> Mathematica Amateur
> Leanne Ussher

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