Re: Copy branch/leaf

From: Hovhannes Khandanyan <khandan_at_cern.ch>
Date: Fri, 18 Feb 2011 15:41:32 +0100

Hi Pilippe,

>> What I need is to copy branch1.leaf1 from Tree2 to Tree1.
>
> Why? What you goal/aim?

I have a large analysis NTuple out of which I create a light-weight one which stored eg parameter flagging good events. What I need is to be able to use this flag to look into parameters stored in the original ntuple.

> 
> To associate 2 TTree with related information, we recommend using the TTree Friend concept.
> 
> I.e. the simple way to achieve some similar to what you want is:
> 
>   Tree1->AddFriend(Tree2);

This is exactly what I needed.

Thanks,
Hovhannes

> 
> Cheers,
> Philippe.
> 
> On 2/15/11 9:23 AM, Hovhannes Khandanyan wrote:

>> Dear ROOTers,
>>
>> I have 2 trees that were created from the same data file i.e both tress contain the exact same number of events.:
>>
>> Tree1 - leaf1, leaf2, ...
>>
>> Tree2 - branch1.leaf1, branch1.leaf2..., branch2.leaf1....
>>
>> What I need is to copy branch1.leaf1 from Tree2 to Tree1. Please let em know if this is doable and if so where I can find reference/example code.
>>
>> Thank you,
>> Hovhannes
>>
Received on Fri Feb 18 2011 - 15:41:36 CET