TFit

ROOT
1

I was wondering what the option “M” on TFit helped improve fits of data. And I was also curious if TFit used a least squares method with vertical or perpendicular offsets?

If I wanted to change the fitting methods, is it possible to retrieve to code for the TFit class, or do I need to write my own class and link it with the ROOT library?

Thanks so much for any help anyone can give,

Sanjeeb.

2

There is no TFit class in the ROOT system.
There is a TVirtualFitter and TFitter class.
These classes are typically used by higher
level functions such as TH1::Fit or TGraph::Fit.
See comments in these two functions.
See also fitting examples in the tutorials, eg FittingDemo.C

Rene