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MathGroup Archive 2007

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Re: Stalled at a point

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75228] Re: Stalled at a point
  • From: dh <dh at metrohm.ch>
  • Date: Sat, 21 Apr 2007 23:08:12 -0400 (EDT)
  • References: <f09fmg$kj$1@smc.vnet.net>


Hi Fulya,

first check if an acceptable fit has been reached. If not, use the 

option "StartingParameters " to specifying better start values for the 

parameters.

hope this helps, Daniel



Fulya Bag(c? 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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