Re: TChain of TTrees with weights

Hi Remi,

In your analysis code processing the chain, you can call functions like   TChain::GetFile
  TChain::GetTreeNumber

For example when building the TChain, you can create a user array weights[maxfiles].
Then at each entry call TChain::GetTreeNumber.

Rene Brun

Remi Mommsen wrote:
> Dear rooters,
>
> I have a question concerning weights when using a TChain. Assume I
> have 3 root files, each containing a tree myTree. I'd like to chain
> the 3 root files together using TChain. However, each myTree should
> have a different weight depending on the root file it resides. I
> understand that TChain uses by default the weight stored in the file.
> However, in my case the trees in the file does not have a weight set
> yet. How do I do this?
>
> TIA,
> Remi
>
>
> --
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> Remigius K. Mommsen e-mail: mommsen_at_fnal.gov
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Received on Mon May 21 2007 - 08:30:29 CEST