Hi Rooters, I have a large sample of data (>1.5e6 evts) and I want to generate scatter plots. Using the command root> ntuple.Draw("y:x"); works fine, but displays only the first (20,000 ?) events. That's ok, then I do root> ntuple.SetEstimate(1500000); root> ntuple.Draw("y:x"); and I get either this error ---------------- Error in <RootX11IOError>: fatal X11 error (connection to server lost?!) **** Save data and exit application **** --------------- or this error -------------- *** Break *** write on a pipe with no one to read it Error in <RootX11IOError>: fatal X11 error (connection to server lost?!) **** Save data and exit application **** ------------- Then I have to quit ROOT. I have not gone through exercise when which error appears. These error messages do not appear in 1D histograms, i.e root> ntuple.SetEstimate(1500000); root> ntuple.Draw("x"); root> ntuple.Draw("y"); works fine. Now I tried to find the "bad" event and I then I did the following: root> ntuple.SetEstimate(#_of_bad_event); root> ntuple.Draw("y:x"); Then I get the following error: ----------------------- Error in <RootX11Error>: BadLength (poly request too large or internal Xlib length error) (XID: 0) ---------------------- The ROOT freezes and I have to kill the process. I cannot see anything wrong with the event. Any ideas? I run DU 4.0A and ROOT 2.00/05 Thanks. Wolfgang
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