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How to Catch FindRoot::lstol error in FindRoot loop

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  How to Catch FindRoot::lstol error in FindRoot loop Themis Matsoukas <tmatsoukas@me.com> - 2011-05-31 11:47 +0000
    Re: How to Catch FindRoot::lstol error in FindRoot loop Armand Tamzarian <mike.honeychurch@gmail.com> - 2011-06-01 08:33 +0000

#2820 — How to Catch FindRoot::lstol error in FindRoot loop

I have a Table that solves a system of two non-linear equations for 18 different data points using FindRoot. The table works and I get results for every iteration but I also get two FindRoot::lstol errors. How can I identify the iteration that produces the error? I don't want to put Print statements to catch the error manually.

Thanks

Themis

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#2860

On May 31, 9:47 pm, Themis Matsoukas <tmatsou...@me.com> wrote:
> I have a Table that solves a system of two non-linear equations for 18 different data points using FindRoot. The table works and I get results for every iteration but I also get two FindRoot::lstol errors. How can I identify the iteration that produces the error? I don't want to put Print statements to catch the error manually.
>
> Thanks
>
> Themis

Something like this should help (in the documentation
Options>Evaluation Monitor)

{res, {evx}} = Reap[FindRoot[x^2 == Exp[x], {x, 0},
EvaluationMonitor :> Sow[x]]]


Mike

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