[ROOT] HOW TO: Keep Histograms in Memory

From: Frederic Sarazin (sarazin@triumf.ca)
Date: Wed May 29 2002 - 02:17:51 MEST


Dear ROOTers,

I want to be able to recall saved spectra from previous runs to
compare them with the data I'm getting online. So, what I would
like to do is open a file (*f), read the keys (f->GetListOfKeys())
and get the spectrum I'm interested in (TObj*)f->Get("MyHist")
(call it with a different name to avoid conflict with what is already
in memory),
then CLOSE the file and look for an other one. But, as it is stated
in the manual, the CLOSE process destroy all objects which are
"linked" to this file.

Is there any way to force an histogram to stay in memory once it
has been "uploaded" ?

Thanks

Fred



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