Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Re: FindFit::nrlnum Error Message
Posted:
Nov 8, 2012 7:00 PM


On Nov 8, 2012, at 2:07 AM, benz <sitthichaisa@gmail.com> wrote:
> I'm trying to fit the data to the curve using FindFit function and i got Error Message > > FindFit::nrlnum: The function value {1.49186*10^209.32484*10^16 I,1.59454*10^182.00252*10^15 I,<<8>>,<<99>>} is not a list of real numbers with dimensions {109} at {RMSX1,aX1,nX1,mX1} = {841.739,86.6839,24.2917,11.7296}. > > I'm trying to solve it for days now and i really have no idea what to do next. Plz help! > > this is the link > = http://www.4shared.com/file/54Tpu4BB/plz_help_FitFit_Error_Message.html?
Hard to answer without seeing the model you're trying to use. But evidently some numerical "fuzz" is involved. You probably can solve it by using Chop to get rid of the small imaginary terms 9.32484*10^16 I, etc.
 Murray Eisenberg murray@math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 5491020 (H) University of Massachusetts 413 5452838 (W) 710 North Pleasant Street fax 413 5451801 Amherst, MA 010039305



