Hi Frederic,
after getting the histogram do:
myHist->SetDirectory(0);
to decouple it from the open file directory. Now you can close the file
and continue using myHist.
-- Fons
On Thu, 2002-05-30 at 00:07, Frederic Sarazin wrote:
> Hi,
> I repost my previous email with a question mark !!!
>
> ------------------------------------------------
>
> 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
>
>
--
Org: CERN, European Laboratory for Particle Physics.
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