Re: [ROOT] Updating existing tree.

From: Nicholai Kuropatkin (kuropat@fnal.gov)
Date: Mon Feb 05 2001 - 16:49:31 MET


Dear Rene.
I have tested the algorithm. It works fine.

      Thanks.
                       Nikolai.

On Fri, 2 Feb 2001, Rene Brun wrote:

> Hi Nicholai,
> 
> You can add new data to an existing Tree:
> 
>  - open the file in "Update" mode
>  - get the Tree from the file
>  - set the branch(es) address
>  - continue your fill loop
>  - save the new Tree header mytree->Write()
>  - close the file
> 
> This works OK if you simply want to add new entries.
> If you want to add one or more branches, you can proceeed like above
> for the first 3 steps, then
>  - create your new branch
>  - fill ONLY this branch, making sure that you have the same number of entries
>    at the end in all your branches.
>  - write the header, etc
> 
> Rene Brun
> 
>  



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