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--- soft:root [2021/02/08 14:31] – [Get max and mim from TGraph] Ce Zhang
+++ soft:root [2023/05/24 09:51] (current) – [ROOT study] Ce Zhang
@@ Line 1: / Line 1: @@
 =====ROOT study=====
+==== Divide ====
+<code>
+hHitTime_Ratio[i] = new TH1F(*hHitTime_Num[i]);
+hHitTime_Ratio[i]->SetName("hFRSignal");
+hHitTime_Ratio[i]->Divide(hHitTime_Den[i]);
+</code>
+==== Sub Canvas and Pads ====
+<code>
+TCanvas *c1 = new TCanvas(“c1”, “c1”, w, h);
+c1->SetWindowSize( w+(w-c1->GetWw()), h+(h-c1->GetWh()) );
+c1->Divide(2, 1); // … or … gPad->Divide(2, 1);
+TVirtualPad *c1_1 = c1->cd(1); // enter the first pad
+gPad->Divide(2, 2); // … or … c1_1->Divide(2, 2);
+// enter the 4 sub-pads and do stuff
+c1_1->cd(1); // … or … (c1->cd(1))->cd(1);
+(new TText(0.1, 0.5, “c1 … 1 … 1”))->Draw(); gPad->Update();
+c1_1->cd(2); // … or … (c1->cd(1))->cd(2);
+(new TText(0.1, 0.5, “c1 … 1 … 2”))->Draw(); gPad->Update();
+c1_1->cd(3); // … or … (c1->cd(1))->cd(3);
+(new TText(0.1, 0.5, “c1 … 1 … 3”))->Draw(); gPad->Update();
+c1_1->cd(4); // … or … (c1->cd(1))->cd(4);
+(new TText(0.1, 0.5, “c1 … 1 … 4”))->Draw(); gPad->Update();
+</code>
+==== TF1 ====
+<code>
+TF1 * fit1 = new TF1("fit1","[0]*exp([1]*x)",3e-6,9e-6);
+fit1->SetParameters(0.4,0.4e5);
+f3->Fit(fit1,"","",3e-6,8e-6);
+gStyle->SetOptFit(0111);
+</code>
+[[https://root.cern.ch/root/htmldoc/guides/users-guide/FittingHistograms.html|gStyle->SetOptFit(1011);]]
+==== Time ====
+TDatime
+<code>
+TDatime * Time = new TDatime();
+cout<<Time->AsString()<<" "<<Time->GetDate()<<" "<<Time->GetTime()<<endl;
+// output: Fri Jul 30 09:56:02 2021 20210730 95602
+// ...
+c1->SaveAs(Form("MuonTracks-%d-%d.pdf",Time->GetDate(),Time->GetTime()));
+</code>
 ==== Get max and mim from TGraph ====