MathGroup Archive: April 2007 [00553]

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Re: Stalled at a point

To: mathgroup at smc.vnet.net
Subject: [mg75252] Re: Stalled at a point
From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
Date: Sun, 22 Apr 2007 05:09:05 -0400 (EDT)
References: <f09fmg$kj$1@smc.vnet.net>

Hi,

try NMinimize[] that uses global methods to find the
minimum. You may have to write out the objective
function of your fit by your self.

Regards
   Jens

Fulya BaÄ?cÄ± wrote:
> Hello everyone,
> 
> I want to fit data to a function and find two parameters beta and beam
> radius.I use NonlinearRegress for this. But it gives this error after 10
> iterations:
> The step size in the search has become less than the tolerance prescribed by
> the PrecisionGoal option, but the gradient is larger than the tolerance
> specified by the AccuracyGoal option. There is a possibility that the method
> has stalled at a point which is not a local minimum.
> What do I have to do ?
> Any help is greatfully appreciated.
> Thank you,
> 
> Fulya
> 
>

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