Keep one ProcessID when merging ROOT files

ROOT
1

Hello,

I am merging over 150 ROOT files into a single one after applying some cuts. Each separate ROOT file has a ProcessID number tagged to it which appears when you open the tree in interactive mode. When I merge 150 files together, I get 150 of those ProcessID’s in my new ROOT file.
How can I get rid of them and keep one ProcessID for the newly created file?

Thanks a lot,
Amin

2

Hi Amin,

I am not sure that opening a tree in interactive mode displays anyhing unless requested: can you be more specific?
In general keeping the ProcessIDs is a good idea. They do not require much space on disk and are used to manage correctly entities such as references which may be stored in the branches of the trees.

Cheers,
Danilo

3

Hi Danillo,

I don’t want to get rid of ProcessID entirely, I just want to unify them all in one. I don’t know if that’s possible.
Thank you.

Amin

4

Hi Amin,

I think the problem is not well defined as they are distinct entities since they carry different information.

Cheers,
D

5

I see!
Thanks a lot Danillo.

Best,
Amin