Re: FindRoot, suppressing complex interval-numbers
- To: mathgroup at smc.vnet.net
- Subject: [mg70894] Re: FindRoot, suppressing complex interval-numbers
- From: dh <dh at metrohm.ch>
- Date: Wed, 1 Nov 2006 03:55:02 -0500 (EST)
- References: <ei4lgf$dgg$1@smc.vnet.net>
$Version
5.1 for Microsoft Windows (October 25, 2004)
Hi Paul,
can't see any complex numbers from
> FindRoot[Sin[x] +2, {x, 1.656 10^8, 1.653 10^8, 1.658 10^8},
> EvaluationMonitor :> AppendTo[xs, x]]
Are you fooling yourself?
Daniel
Paul wrote:
> Hello,
> 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,
> Paul
>
> (Mathematica 5.2)
>