RE: write out a TNtuple

I'd like to write out a read back a simple TNtuple. This seems to be kind of compicated with "keys" and such. Isn't there a simple way to do it? Like t->Write("filename")?

-Art S.

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On Thu, 25 Aug 2005, Philippe Canal wrote:

> > the root reads it very slowly(Is it normal?).
>
> In general this should not be the case (i.e. reading an entry from the
> original files
> or from the merge files should be about the same).
>
> > I want to split again this file to smaller files, Is it possible?
>
> You can simply clone the large tree but setting the TTree maximum
> size to a low number (see TTree::SetMaxTreeSize)
> (see $ROOTSYS/tutorials/copytree*.C)
>
> Cheers,
> Philippe.
>
> -----Original Message-----
> From: owner-roottalk_at_pcroot.cern.ch [mailto:owner-roottalk_at_pcroot.cern.ch]
> On Behalf Of Saeid Paktinat Mehdiabadi
> Sent: Thursday, August 25, 2005 8:58 AM
> To: roottalk (Mailing list discussing all aspects of the ROOT system)
> Subject: [ROOT] Split a root file!
>
> Hello ROOT developers,
>
> I had something like 100 root files with same structure,
>
> I used, TChain::Merge(), to merge them and make a single file, this file is
> very big and the root reads it very slowly(Is it normal?).
>
> I want to split again this file to smaller files, Is it possible?
>
> What's the solution?
>
> Thank you,
>
> Saeid
>
>
Received on Wed Aug 31 2005 - 04:15:13 MEST