On Fri, 5 Feb 1999, Rene Brun wrote: > Christoph Borgmeier wrote: > > > [...] An existing > > histogram has to be overwritten. I do not want to delete it and copy > > constuct a new one, since it is attached to lists. I have only a TH1 > > pointer, while the histogram is of type TH1F or TH2F (or maybe something > > else). > > > > Hi Christoph, > What do you want to do exactly? > You can do all sorts of operations with an histogram: > TH1::Reset() > TH1::Add to replace its contents by another histogram contents > > Also note that you can detach an histogram from a directory by calling > TH1::SetDirectory(0) [...] Hi Rene, thank you for your answer. I noticed now that I do not understand it completely. Looking into the sources, I find that TH1::Reset does not reset the bin contents. What is it supposed to do? My solution is now: TH1* a = ..., *b = ...; a->Add(b,b,1,0); It looks a little bit funny. Is this the preferred solution? Kind regards Christoph
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