Changing leaf in TTree ROOT

[etejedor]

Hello,

Perhaps this answer will help you:

Updating Trees in Already Existing Rootfiles

Hello Rooters, Here is my dilemma: I have a rootfile with a tree that already exists called “MCA927”, in this tree there are many branches. I then run a root macro to add branches to this tree. But, here is the catch, every time I run my macro it creates these branches over and over again. I want these branches to be written once and if I do run it again, then I would like them to be overwritten. My code is below for reference. Thanks a bunch!! void MCA927RawViewer(char filename[130], bo…

Pinging @pcanal in case he wants to add something.