Hi Helmut,
I cannot reproduce your problem.
Rene Brun
Helmut Schmuecker wrote:
>
> Hi rooters,
>
> After changing from version 2.25-03 to version 3.00-06, one of my macros,
> which creates TEventlists by using the TTree::Draw(">>eventlist","some
> selection string") method, does not work anymore. With 3.00-06 nothing is
> written into the Eventlists if the selection string becomes too long.
>
> I have tried to reproduce the effect with the TTree T in the
> $ROOTSYS/test/Event.root file and the following macro. It is not the same
> effect, but what happens is also pretty weird:
>
> void testtree(){
>
> gSystem->Load("libEvent.so");
> TFile f("Event.root","read");
> TTree* tree = (TTree*)f.Get("T");
>
> TCut cut1 = "abs(fTracks.fBx-0.1)<0.2 && fTracks.fPx>1.0 &&
> fTracks.fPz-fTracks.fPy>0.0 && !fTracks.fCharge && !fTracks.fValid &&
> fTracks.fPz>1.0 && fTracks.fRandom>800";
> TCut cut2 = "fTracks.fNpoint>64";
>
> TCut magic = cut1 && cut2;
>
> cerr << "\n\n\n"
> << cut1 << "\n\n"
> << cut2 << "\n\n"
> << magic << endl;
>
> TCanvas* can = new TCanvas("can","",900,300);
> can->Divide(3,1);
>
> can->cd(1);
> T->Draw("fTracks.fNpoint", cut1);
> can->cd(2);
> T->Draw("fTracks.fNpoint", cut2);
> can->cd(3);
> T->Draw("fTracks.fNpoint", magic);
>
> }
>
> It seems that in "T->Draw("fTracks.fNpoint", magic)" the last cut
> (cut2 = "fTracks.fNpoint>64") is simply ignored. In the third histogram
> I see also entries with fNpoint<=64. If one of the cuts in
> cut1 is removed, e.g. "fTracks.fRandom>800", everything looks fine again.
>
> With 2.25-03 these problems don't occur.
>
> Any Idea?
>
> cheers,
> Helmut
This archive was generated by hypermail 2b29 : Tue Jan 01 2002 - 17:50:41 MET