Hi, I am excecuting a .C macro in CINT which calls in a loop a member of a class which is linked to ROOT. In this member I am filling an Ntuple. The Ntuple is filled correctly, which I see after my .C macro has finished (I can look at the ntuple with ->Draw(..)). Now, when I try to Draw() the ntuple during filling inside the filling loop I get a segmentation fault. here is my .C with Examination* e; // *e is object of my class // linked to ROOT ... while(e->NextRawEvent() == kTRUE) { // reads data from disk .... e->FillNtuple(); // fills an ntuple ... e->GetTrackHitNtuple()->Draw("ut-u:vt","plane == 3"); // see below... } ... the Ntuple is declared private in my class Examination.h as NTuple* fNtData; and in a constructor for the object e fNtData = new TNtuple("A","B","plane:u:ut:vt"); The member GetTrackHitNtuple() is TNtuple* Examination::GetTrackHitNtuple(){ return fNtData; } and root knows about the pointer to the Ntuple: root [2] e->GetTrackHitNtuple() (class TNtuple*)0x40b953c0 But this ntuple can only be drawn when the .C finished. Why? Dirk
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