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Problem with NonlinearModelFit

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128732] Problem with NonlinearModelFit
  • From: "Ludwig Greil" <Ludwig.Greil at physik.uni-regensburg.de>
  • Date: Wed, 21 Nov 2012 19:50:15 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-newout@smc.vnet.net
  • Delivered-to: mathgroup-newsend@smc.vnet.net

Hello everyone,

I have this problem fitting the Real part of a function that at some point 
develops an imaginary part. My dataset is real-valued, and i try fitting 
Re[f] and afterwards generating the MeanPredictionBands. The fitting of 
the function goes fine, but as soon as i try to create the MeanPredictionBands, i get the following error:


Experimental`NumericalFunction::nnum: The function [...] is not a number at {fitparameters}.

Then I tried a normal function that is real-valued everywhere, and tried fitting Re[f] and then create the MeanPredictionBands and again, the same error appears.

The question I have is basically: Is there a way to do what i want to do?

Thank you all for your help,
Ludwig Greil



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