Hi Pasha, your answer solved the problem partially. When I try to access the next element of the TClonesArray I still get segmentation fault: root [0] TClonesArray* tps = new TClonesArray("TH1F",5); root [1] TH1F* dummy0 = new((*tps)[0]) TH1F("bname0","btitle0",40,-20.,200); root [2] TH1F* dummy1 = new((*tps)[1]) TH1F("bname1","btitle1",40,-20.,200); root [3] tps[0] // just to check whether it is there (class TClonesArray)1077780400 root [4] tps[1] (class TClonesArray)1077780448 root [5] tps[2] (class TClonesArray)1077780496 root [6] tps[0]->Draw(); // now draw the first histogramm of the array Warning in <MakeDefCanvas>: creating a default canvas with name c1 // o.k. this works, but drawing the next element gives root [7] tps[1]->Draw(); *** Break *** segmentation violation ( 0) 0xc1667d40 StackTrace__11TUnixSystemFv + 0x28 [/afs/cern.ch/na49/library/local/ROOT/hpux10aCC/root/lib/libUnix.sl] ( 1) 0xc16667f0 DispatchSignals__11TUnixSystemF8ESignals + 0xd0 [/afs/cern.ch/na49/library/local/ROOT/hpux10aCC/root/lib/libUnix.sl] thanks for any hints Dirk
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