Hi Thomas,
By default, when the TH1 constructor is called, it registers the object
to gDirectory->GetList(). You get the warning in case there is already
an histogram with teh same name in this list.
You can disable the default behaviour of registration by calling teh
static function TH1::AddDirectory(kFALSE);
Rene Brun
Thomas Bretz wrote:
>
> Hello,
>
> I have an object (derived from TObject) which containes some histograms,
> like:
> class A {
> TH1F *hist1;
> TH1F *hist2;
> }
>
> The histograms are instantiated in the constructor. After constructing
> an object of Type A with
> A* a;
> I'm going to 'clone' it using something like:
> A* b = (A*)a->Clone();
>
> Now I get many many warnings like (the object contains about 1000
> histograms)
> Warning in <TH1::Build>: Replacing existing histogram: HiGain000
>
> Is there a simple way to get rid of this warnings when cloning my object
> (more than once)?
>
> Thanks in advance,
> Thomas.
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