Re: Help with an error with NonlinearModelFit, Mathematica 7.0
- To: mathgroup at smc.vnet.net
- Subject: [mg99601] Re: Help with an error with NonlinearModelFit, Mathematica 7.0
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Sat, 9 May 2009 03:19:21 -0400 (EDT)
On 5/7/09 at 6:35 AM, mgao4793 at gmail.com (Anonymous) wrote:
>I'm trying to find a fit to a large set of data.
>Here are In[1], In[2].
>In[1] := {{421.1, 6591.10}, ...};
>(there are way more points, in fact there are 35 in total, but I
>don't want to list them. All are real numbers.)
>In[2] := nlm = NonlinearModelFit[data, Log[ak^2 + bk + c], {a,b,c},
>k]
>Then mathematica gives an error that basically says that the
>function "is not a list of real numbers"
>Of course it is, so how do I fix this?
Are you sure? How did you verify there were no non-numeric
elements in your data?
Try doing Union[Head/@Flatten[data]] where data is the array you
are feeding into NonlinearModelFit. That will return a list of
all data types in the array. Does it contain anything other than
Integer, Real or Rational? If so, that is the problem.