[d2n-analysis-talk] DL.bit3 Variable (Followup From 9/2/10 Meeting)

[David Flay]

Hi Brad,

So I looked into my code, and I had (for hit 1):

DL.bit3[Ndata.DL.bit3 - 2]

However, if Ndata.DL.bit3 < 2, I would have a negative index.  So, to fix
that, I added the cut:

Ndata.DL.bit3!=1 to the rest of the code for that plot.  So I have:

    //hit 0
    c1->cd(2);
    gPad->SetLogx(0);
    gPad->SetLogy(1);
    cut3 = cut2+"&&(Ndata.DL.bit3!=0)&&(DL.bit3[Ndata.DL.bit3-1]>0)";
    rootvar = "DL.bit3[Ndata.DL.bit3-1]";
    range = ">>g0(100,0,2000)";
    plot = rootvar+range;
    ch->Draw(plot,cut3);
    g0->SetTitle("DL.bit3[2] [hit 0] {Good Electron Cuts}");
    g0->GetXaxis()->SetTitle(rootvar+" [hit 0]");
    g0->GetXaxis()->CenterTitle();
    Double_t hit0 = g0->GetEntries();
    c1->Update();

    //hit 1
    c1->cd(3);
    gPad->SetLogx(0);
    gPad->SetLogy(1);
    cut3 =
cut2+"&&(Ndata.DL.bit3!=0)&&(Ndata.DL.bit3!=1)&&(DL.bit3[Ndata.DL.bit3-2]>0)";
    rootvar = "DL.bit3[Ndata.DL.bit3-2]";
    range = ">>g1(100,-100,1900)";
    plot = rootvar+range;
    ch->Draw(plot,cut3);
    g1->SetTitle("DL.bit3[1] [hit 1] {Good Electron Cuts}");
    g1->GetXaxis()->SetTitle(rootvar+" [hit 1]");
    g1->GetXaxis()->CenterTitle();
    Double_t hit1 = g1->GetEntries();
    c1->Update();

utilizing this code, I get the behavior I would have expected (that is, no
large peak at DL.bit3 <=20).  See attached plot.




-------------------------------------------------
David Flay
Physics Department
Temple University
Philadelphia, PA 19122

office: Barton Hall, BA319
phone: (215) 204-1331

e-mail: flay at jlab.org
            flay at temple.edu

website: http://www.jlab.org/~flay
              http://quarks.temple.edu
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