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Extracting Parameter Values from NonlinearModelFit

• To: mathgroup at smc.vnet.net
• Subject: [mg127885] Extracting Parameter Values from NonlinearModelFit
• From: colang <colangmp at gmail.com>
• Date: Thu, 30 Aug 2012 04:07:26 -0400 (EDT)
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Hi, 

I'm modelling a series (>2000) of data points (5x2 lists) using NonlinearModelFit, and trying to extract the Fitted Parameter Values to separate lists using the following code:

model = a Exp[-k x];
i = 1;
For[i = 1, i <= Length[data],
  {nlm = NonlinearModelFit[data[[i]], {model, k<1}, {a, b}, x]["BestFitParameters"];
   aValues = Append[aValues, nlm[[1, 2]]];
   kValues = Append[kValues, nlm[[2, 2]]]},
  i++
  ];

I'm able to determine the Parameters via nlm, but can't extract the parameter values. 

Any thoughts?

Thanks in advance!

C

• Follow-Ups:
  • Re: Extracting Parameter Values from NonlinearModelFit
    • From: Bob Hanlon <hanlonr357@gmail.com>