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MathGroup Archive 2004

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Re: FindRoot s all

  • To: mathgroup at
  • Subject: [mg49416] Re: [mg49415] FindRoot s all
  • From: Andrzej Kozlowski <akoz at>
  • Date: Mon, 19 Jul 2004 07:46:06 -0400 (EDT)
  • References: <>
  • Sender: owner-wri-mathgroup at

On 18 Jul 2004, at 21:09, Narasimham G.L. wrote:

> *This message was transferred with a trial version of CommuniGate(tm) 
> Pro*
> y[u_,c_]=c^u-u^c-1 ;
> Plot[y[x,2],{x,-5,5}]; FindRoot[y[x,2]==0,{x,-5,5}];
> " Solution settles to a value outside the interval
> of roots of its derivative (humps and valleys),it may be
> the problem of Newton-Raphson diverging tangets.How to
> capture all roots [in this case {x -> 0, 1}] ? It should be
> valid for all c."
I am not sure what you  mean by

> How to
> capture all roots [in this case {x -> 0, 1}] ?

the graph clearly shows three roots. FindRoot gives you one of them.  
You can get them all (as discussed in this list recently) with




or using Ted Ersek's RootSearch package on MathSource.

Andrzej Kozlowski
Chiba, Japan

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