Hi Joao,
Use TTree::CopyTree. Example
TFile *f1 = new TFile("hsimple.root");
TTree *ntuple = (TTree*) f1->Get("ntuple");
TFile *f2 = new TFile("small.root","recreate");
TTree *small = ntuple->CopyTree("py>2");
Rene Brun
On Wed, 22 Aug 2001, Joao Guimaraes da Costa wrote:
> Hi,
>
> I would like to know what is the easiest way to accomplish the following.
>
> I have a large tree with many entries which takes a long time to
> process. I would like to select events that pass specific cuts and
> write them into a different tree, in a different file, with EXACTLY the
> same structure as the first.
>
> Unfortunately, it seems that TTree does not have a "Filter" method.
>
> Is there an easy way of doing this?
>
> Thank,
> -Joao
>
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