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Re: Method->NMinimize in FindFit Crashes the Kernel

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89560] Re: Method->NMinimize in FindFit Crashes the Kernel
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 12 Jun 2008 06:31:16 -0400 (EDT)
  • References: <g2qhi6$8p3$1@smc.vnet.net>


version 6.0.2: "6.0 for Microsoft Windows (32-bit) (February 7, 2008)"

1GB RAM

Hi Kezhao,

this works for me with the result:

{m -> 1.92446, s -> 1.29603}

Daniel







Kezhao Zhang wrote:

> I am running Mathematica 6.0.2.1 on 32-bit Windows Vista with 3GB of

> RAM. The following code crashes the Kernel:

> 

> x = Range[1, 10, 0.01];

> 

> y = Exp[-0.1 x];

> 

> FindFit[Thread[{x, y}], 1 - 1/2 Erfc[(m - Log[t])/(Sqrt[2] s)], {s,

> m}, t, Method -> NMinimize]

> 

> 

> FindFit with Method->NMinize works fine when the number of data points

> is small, e.g., x=Range[1,10,0.1].

> 

> I wonder whether this is a bug or there is a way to  prevent the

> kernel crash.

> 

> Thanks.

> 

> Kezhao

> 





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Daniel Huber

Metrohm Ltd.

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Tel. +41 71 353 8585, Fax +41 71 353 8907

E-Mail:<mailto:dh at metrohm.com>

Internet:<http://www.metrohm.com>




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