Re: Help with an error with NonlinearModelFit, Mathematica 7.0

*To*: mathgroup at smc.vnet.net*Subject*: [mg99587] Re: Help with an error with NonlinearModelFit, Mathematica 7.0*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Fri, 8 May 2009 00:18:54 -0400 (EDT)*References*: <gtudh6$it8$1@smc.vnet.net>

Please post the list, 35 pairs of numbers is not that long. Are you sure you didn't confuse an o or O for a 0? Or type two decimal points in a number or so? Try this on your list: And @@ NumericQ /@ Flatten[{{1, 2}, {3, 3}, {2, 3}}] replace the list above with yours. It should yield True. Additionally, your fit function is missing a space between k and its coefficients... Cheers -- Sjoerd On May 7, 12:35 pm, Anonymous <mgao4... at gmail.com> 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?