本文整理汇总了C++中TChain::GetAlias方法的典型用法代码示例。如果您正苦于以下问题：C++ TChain::GetAlias方法的具体用法？C++ TChain::GetAlias怎么用？C++ TChain::GetAlias使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类TChain的用法示例。
在下文中一共展示了TChain::GetAlias方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: BkgFluctuation
void BkgFluctuation(TString infname = "../ntv6_datambv3rand_djcalo_c0to30_offset0.root",
TCut myCut = "cent<30", char *title = "",bool drawLegend = false,
bool drawSys = true
)
{
gStyle->SetHistLineWidth(2);
// ===========================================================
// Get Input
// ===========================================================
TChain* t = new TChain("ntjt");
t->Add(infname);
t->AddFriend("tcone",infname);
cout << infname << ": " << t->GetEntries() << endl;
t->SetAlias("cptsub0Merge0","cpt[0][1]+cpt[0][2]-(cptbg[0][1]+cptbg[0][2])");
t->SetAlias("cptsub0Merge1","cpt[0][3]-(cptbg[0][3])");
t->SetAlias("cptsub0Merge2","cpt[0][4]+cpt[0][5]-(cptbg[0][4]+cptbg[0][5])");
t->SetAlias("cptsub0Merge3","(Sum$(cpt[0])-cpt[0][0])-(Sum$(cptbg[0])-cptbg[0][0])");
// ===========================================================
// Analysis Setup
// ===========================================================
TH1::SetDefaultSumw2();
const int nBin = 3;
double bins[nBin+1] = {1.,4,8,160};
TCut evtCut = "nljet>100&&abs(nljetacorr)<1.6&&aljet>50&&abs(aljetacorr)<1.6&&jdphi>2./3*TMath::Pi()&&!maskEvt";
TCut exclusion = "abs(nljetacorr)>0.8"; //&&abs(aljetacorr)>0.8";
evtCut = evtCut&&exclusion;
//Int_t colors[7] = {kBlue, kCyan-3, kYellow+1, kOrange+1, kGreen+2, kMagenta, kRed };
Int_t colors[7] = {kYellow+2, kGreen+2,kRed };
// ===========================================================
// Book Histograms
// ===========================================================
vector<TH1D*> vhBgSub;
for (Int_t i=0; i<nBin+1; ++i) {
vhBgSub.push_back(new TH1D(Form("hBgSub_%d"),";(Sig Cone #Sigma p_{T}) - (Bkg Cone #Sigma p_{T}) (GeV/c);fraction;",50,-300,300));
}
Float_t numEvt = t->GetEntries(evtCut&&myCut);
cout << "Total Sel evt: " << numEvt << endl;
for (Int_t i=0; i<nBin+1; ++i) {
TString var(Form("cptsub0Merge%i",i));
cout << "Sel evt: " << t->GetEntries(evtCut&&myCut&&var) << endl;
cout << "var: " << t->GetAlias(var) << endl;
t->Project(vhBgSub[i]->GetName(),var,(evtCut&&myCut&&var)*"weight");
Float_t mean = vhBgSub[i]->GetMean();
Float_t rms = vhBgSub[i]->GetRMS();
cout << "bgsub mean: " << mean << " rms: " << rms << endl;
vhBgSub[i]->Scale(1./numEvt);
cout << "Bin " << i << " rms/sqrt(250): " << rms/sqrt(250)
<< " r=0: " << rms/sqrt(250.)*sqrt(fracArea(0))
<< " r=0.8: " << rms/sqrt(250.)*sqrt(fracArea(0.8)) << endl;
}
TCanvas * c2 = new TCanvas("c2","c2",600,600);
c2->SetLogy();
vhBgSub[nBin]->SetAxisRange(1e-5,5,"Y");
vhBgSub[nBin]->Draw("E");
for (Int_t i=0; i<nBin; ++i) {
vhBgSub[i]->SetLineColor(colors[i]);
vhBgSub[i]->Draw("same hist");
}
vhBgSub[nBin]->Draw("Esame");
TLegend *leg = new TLegend(0.19,0.70,0.53,0.92);
leg->SetFillStyle(0);
leg->SetBorderSize(0);
leg->SetTextSize(0.035);
leg->AddEntry(vhBgSub[nBin],"CMS 0-30%","");
leg->AddEntry(vhBgSub[nBin],"Random Cone (MB Sample)","");
leg->AddEntry(vhBgSub[nBin],Form("> %.1f GeV/c",bins[0]),"pl");
for (int i=0;i<nBin;++i) {
if (i!=nBin-1){
leg->AddEntry(vhBgSub[i],Form("%.1f - %.1f GeV/c",bins[i],bins[i+1]),"l");
} else {
leg->AddEntry(vhBgSub[i],Form("> %.1f GeV/c",bins[i]),"l");
}
}
leg->Draw();
}