I got the following problem:
I create a Tree with an Event branch, each Event contains 2 lists
of histograms
1 List of raw data histogram
1 List of data corrected histogram
I first read raw data binary and create a file containing events
with only the first list filled.
I then read this ROOT file and I want to update my file with the second
list filled.
I just tried to open the file in UPDATE mode and added a call to
Tree->Fill() after the processing of each event and it crashed.
Is it possible to do this or do I have to create a new Tree ?
Thanks in advance for the answer
Laurent Mirabito