Hello, I just ran into the same problem as Wei Xie did last year: 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). Fons Rademakers wrote on 25 Jun 1998: > use either the histogram TH1::operator=() or the TH1::Copy() > or the TObject::Clone() methods. > > Cheers, Fons. > > Wei Xie wrote: > > > > Dear ROOTers' > > > > Is there a way to copy one histogram directly to another > > histogram ? [...] As far as I understand it, * TH1::operator does not copy the entire object (no polymorphism possible), * TH1::Copy() is protected, * TObject::Clone() creates a new object in a different memory location. Do I miss the point here? Do I have to use memcpy (*shudder*)? Thank you for your answer Christoph -- Christoph Borgmeier Mail: DESY F15/HERA-B, Geb. 61/117 Notkestr. 85, 22607 Hamburg Humboldt Univ Berlin Phone: +49 40 8998 4850 Email: Christoph.Borgmeier@desy.de
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