Copy subsets of Trees from different files into one file

ROOT
1

Hi,

similar to what is done in tutorial copytree3.C I want to copy a subset of a tree into a new tree and save it in a separat file. However, in my case the original data are contained in several files whereas I would like to save the copied subsets all to the same file. Is this possible?

Regards, Alexander

2

Yes use a TChain as input. TChain is a TTree, so CopyTree works for a TChain too.

Rene

3

Thanks for the help. Is there any other option? My program is not as simple as the example and using TChain would require some major changes.

Regards, Alexander

4

Hi,

Most likely all you need to do is:nexttree->AddClone(newtree); nexttree->CopyAddresses(newtree);

Cheers,
Philippe.