Average of histograms getting from root files

[sohail]

i am trying to take average of histograms which i retrieve from a root file? how can i do it?

[ksmith]

Check out the search feature:
https://root-forum.cern.ch/search?q=average%20histogram

Gives this complicated discussion:

Calculate the average histogram of various histograms

I have a root file containing many pulses in histogram format. What I am trying to do is calculate the average pulse of those histograms. The code I am using is the following [code]#include “Riostream.h” #include void mean_Gamma_Flash(){ cout << “-------------------------------------------------------------------” << endl; gROOT->SetStyle(“Plain”); gStyle->SetOptStat(0000); gStyle->SetOptFit(0000); gStyle->SetOptTitle(0); Int_t detNum=1; Char_t dname[4]; sprintf(dname,"FIMG"); TStrin…

And this simpler solution:

Averaging histograms

Simply enable error calculation h[i]->Sumw2() before filling histos and then add them up in a loop h[0] = h[0] + h[i]; for i=1, i<N and scale by h[0]->Scale(1.0/N), where N is number of histos.