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Problem with NonlinearModelFit


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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