Hi Peter,
Victor has already posted the solution using TH1::SetDirectory(0).
Currently TH1 objects and TTree objects are automatically added (by
their constructors) to the list of objects in memory in the current
directory.
This has the advantage that histograms in particular can be
automatically
written to the file in one call.
We could provide a function to disable this feature. I see several
possibilities:
1- gROOT->SetAutoAppend(Bool_t append=kTRUE);
This will set a global switch for all directories
2- gDirectory->SetAutoAppend(Bool_t append=kTRUE);
apply only to the specified directory
3- TH1::SetAutoAppend(Bool_t append=kTRUE);
a static function in TH1.
same in TTree.
My prefered solution would be 1. Please give me your suggestions.
Rene Brun
Peter Steinberg wrote:
>
> Hello -
>
> I have an object which creates a set of histograms with distinct
> names. In order to let other users find these histograms by
> gROOT->FindObject(), I put them in the top ROOT directory by
> hand (gDirectory->Append(h), etc.) since I have disabled
> the automatic appending in my object.
>
> However, my object owns these histograms; thus, I would like to be able to
> tell the gDirectory to "forget" them, without touching the object.
> This is not exactly what gDirectory->Delete() does, since this actually
> performs an object->Delete()...
>
> Is there any way to do this? I do not seem to see a "remove" method
> in TDirectory.
>
> - Peter
>
> --
>
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> Dr. Peter A. Steinberg Brookhaven National Laboratory
> Assistant Scientist Bldg 555, Upton NY, 11973
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