i apologize upload this weird question.
But I need a comment on this issue.
I want to get x value at specific TF1.
My function is,
double xmin = 6e25;
double xmax = 1.6e26;
TF1 * pdf = new TF1(“pdf”,"*Poisson( ( /x ), ) / Power( 1/x , 2)", xmin, xmax) ;
pdf->SetParameters(1, flux(energy), event(energy));
At this function, I want to estimate x value which is 90% weight have (when integration between xmin to this x)
Seeing Below figure is much better to understand easily.
I couldn’t solve this issue using my skill.
ROOT Version: 6.08.04
Compiler: Not Provided