Dear roottalk! I am quite new with ROOT and I try to build a class of my own that consists of objects called "tracks". To each track a TClonesArray of so-called "hits" should be generated. This is analogous to the tutorial "creation of a ROOT tree". When I try to get a new instance of a "hit" in the TClonesArray by: void Track::AddHit(Float_t x, Float_t y, Int_t superlayer) { TClonesArray &hits = *fHits; new(hits[fnHits++]) Hit(x,y,superlayer); } I get the following error message from my linker: ./lib/muontest.Linux_intel.n.ARTE-03-01-r2/Track.o: In function `Track::AddHit(float, float, int)': ./lib/muontest.Linux_intel.n.ARTE-03-01-r2/Track.o(.text+0x1af): undefined reference to `Hit virtual table' collect2: ld returned 1 exit status ??? Ulrich Husemann
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