MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

FindRoot, suppressing complex interval-numbers

  • To: mathgroup at
  • Subject: [mg70870] FindRoot, suppressing complex interval-numbers
  • From: "Paul" <pw23 at>
  • Date: Mon, 30 Oct 2006 05:32:57 -0500 (EST)

I have the following problem:
Take the simple example

FindRoot[Sin[x] +2, {x, 1.656 10^8, 1.653 10^8, 1.658 10^8},
EvaluationMonitor :> AppendTo[xs, x]]

In the Help we can read: "FindRoot[lhs==rhs, {x, a, a_min, a_max}]
searches for a solution, stopping the search if x ever gets outside the
range a_min to a_max. "

But when I display xs I can see, that there are also two complex
numbers used.

This is a problem if I use a function (in my case a compiled one)
inside FindRoot, which only accepts real numbers.

So how can I suppress the using of complex numbers in FindRoot?

Best regards,

(Mathematica 5.2)

  • Prev by Date: Re: RandomList and pure function
  • Next by Date: Counting Symbols
  • Previous by thread: Curiosity concerning transformation rules for List
  • Next by thread: Counting Symbols