Variable size array in TTree

ROOT
1

Hello all,

I am trying to do the following :

tree->Branch("EEscsize",&EEscsize,"EEscsize/I"); tree->Branch("ESrechitsize",ESrechitsize,"ESrechitsize[EEscsize]/I"); tree->Branch("ESrechitE",ESrechitE,"ESrechitE[EEscsize][ESrechitsize[EEscsize]]/D");

So essentially I want to define a branch for a tree variable which is 2-D as can be seen
in the above example(ESrechitE) & whose array size is itself a 1-D array(ESrechitsize).

But if I do it this way then it gives me error.
Is there a way to get this working?

Thanks for any help,

Best Regards,
Shilpi

2

This is not supported by TTree::Branch.
Instead I recommend to create your own class and simply create a top level branch with a pointer to you main class.

Rene

3

Hi Rene,

Many thanks for your reply.
Could you please tell me if there is an example somewhere to do it?

Thanks & Regards,
Shilpi

4

See $ROOTSYS/test/Event.h and it’s use in the same directory.

Cheers,
Philippe.

5

Hi Philippe,

thanks a lot for pointing out the reference.
I’ll now have a look at it.

Best Regards,
Shilpi