Sum TNtuple

ROOT
1

Hi,

Is there a way to add TNtuple that have the same structure (same numbers of lines and columns) to get only one TNtuple (something like TH1::Add)

thanks,

Vincent

2

Use TChain::Merge
or utility $ROOTSYS/bin/hadd

Rene

3

Hi Rene,

I 'm not sure it’ll work for what I’d like to do.
I have a single root file filled with several TNtuple, each one having a different name (one name per physics process). I’d like to create a new TNtuple which is the sum of all the others. So I use TNtuple here as a N dimensions array and I’d like to sum every boxes of the array to get only one final array.

Thanks,

Vincent

[quote=“brun”]Use TChain::Merge
or utility $ROOTSYS/bin/hadd

Rene[/quote]

4

We do not have a canned solution for this.
You will need to use existing tools to gather the information (for example MakeSelector or generating a series of histograms).

Cheers,
Philippe