Nonlinear Least Squares Fitting with ROOT?

Does anybody know if it’s possible to do Nonlinear Least Squares Fitting with ROOT? Maybe one of the new MathCore or MathMore has some class for doing it?
I have a complicated function that even Mathematica 5.2 can’t solve the residues derivate linear equation, so no chance of using Linear Least Squares Fitting… and we need something fast, so we can’t use Minuit routines either :frowning:

I can always implement it myself, but if it already exists, there is no point int re-inventing the wheel! :slight_smile: … tting.html


PS: I hope I’m posting in the right place :slight_smile:

Use Minuit (TMinuit) or Fumili (TFumili).
Fumili is in general much faster than Minuit.
However, I do not know what are your requirements in terms of speed.
The reference that you indicate is a trivial case for Minuit.