Dear all, first of all this is my first message to the roottalk list although I have been using root for a couple of years now. My name is Felix Matathias and I am a grad student at the Relativistic Heavy Ion Group at the State University of New York at Stony Brook and a member of the PHENIX collaboration. Enough said :) Root Rocks! To the problem now: I have an online monitoring program, always running, that periodically writes an ntuple to a file. I open the file, write the ntuple, close the file, reset the ntuple, fill new data and the loop continues. The problem is that even if I open the file to write in UPDATE mode the ntuples are written as diffenent keys/objects instead for a single merged ntuple. And therefore a user cannot operate at the prompt and draw the entire history. Is there a way of avoiding this ? I am familiar with the way to retrieve all the keys and merge them into a single Ntuple etc. but I was wondering if root can do such a thing automatically. I am considering doing the Autosave()/SaveSelf() trick but I am a bit nervous having a file open for such a long period of time. Best Regards, Felix
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