Help with an error with NonlinearModelFit, Mathematica 7.0

*To*: mathgroup at smc.vnet.net*Subject*: [mg99525] Help with an error with NonlinearModelFit, Mathematica 7.0*From*: Anonymous <mgao4793 at gmail.com>*Date*: Thu, 7 May 2009 06:35:29 -0400 (EDT)

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?

**Follow-Ups**:**Re: Help with an error with NonlinearModelFit, Mathematica***From:*DrMajorBob <btreat1@austin.rr.com>