Warning in <TFile::Init>

Well, I got the warning:
file teste03.root has no keys
when I enter at the prompt the commands:
root teste03.root
why it happened?

I’ve another question:
when I open a fine *.root it is possible to append the data to the file choosing the delay?


João Pires


This usually means that ‘TFile::Write’ has not been called before closing the file (this can happen in case of crashes).

You can open the file with the open ‘UPDATE’.
However I do not understand what you mean by “choosing the delay”?