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MathGroup Archive 2004

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RE: FindRoot s all

  • To: mathgroup at
  • Subject: [mg49418] RE: [mg49415] FindRoot s all
  • From: "David Park" <djmp at>
  • Date: Mon, 19 Jul 2004 07:46:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

This is another case where I find Ted Ersek's RootSearch package more

y[u_, c_] = c^u - u^c - 1 ;
Plot[y[x, 2], {x, -5, 5}];

RootSearch[y[x, 2] == 0, {x, -5, 5}]
{{x -> 0.}, {x -> 1.}, {x -> 4.25746}}

The package may be obtained at

David Park
djmp at

From: Narasimham G.L. [mailto:mathma18 at]
To: mathgroup at

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."

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