Fitting with a multiplication series and factorial

Rahul · November 11, 2022, 6:46pm

Thanks a lot for your comments and suggestions. I changed the for loop to this:

for (int i = 1; i <= N; ++i)

and I tried to draw a spline with this:

   TSpline3 *s = new TSpline3("Spline",Summation);
   s->SetLineColor(kRed);
   s->Draw("same");

The result is shown below:

P(0) is not actually a data point but is obtained from the extrapolation of a model to N =0. But I think the issues with my fitting are solved now.

Thank you
Rahul