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anderson |
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Divides 2 histograms either from the same or
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different files and plots the output.
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Example commands typed
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at ROOT prompt:
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Divide2hists1D("JetEt", "Jet2Et", "aFile.root", 1.0, 100.0)
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Divide2hists1D("JetEt", "Jet2Et", "firstFile.root", "secondFile.root", 1.0, 100.0)
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with this format:
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Divide2hists1D("Hist1Name", "Hist2Name", "File1.root", "File2.root", Hist1Scale, Hist2Scale)
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Michael B. Anderson
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May 13, 2006
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*************************************************/
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void Divide2hists1D(TString hist1Name,
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TString hist2Name,
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TString file1Name,
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TString file2Name = "",
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Double_t scale1 = 1.0,
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Double_t scale2 = 1.0) {
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int lineWidth = 2;
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TString outputFolder("Images");
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Bool_t displayStatsBox = 0; // 0 = false, 1 = true
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TString imageType = "gif";
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// Image output info
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TString outputType("."+imageType); // OR: png, eps, pdf, etc...
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TString outputName = ""; // set depending on whether file2Name is set - see later
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// Make the output folder (if it exists, nothing is done)
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gSystem->MakeDirectory(outputFolder);
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// Open the 1st file
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TFile *file1 = new TFile(file1Name);
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if ( !file1 ) {
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cout << file1Name << " does not exist." << endl;
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return;
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}
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// Grab a copy of its histogram
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TH1* hist1Copy = (TH1*)file1->Get(hist1Name);
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if ( !hist1Copy ) {
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cout << file1Name << " does not contain " << hist1Name << endl;
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return;
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}
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// Open the 2nd file - if needed
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TFile *file2;
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TH1* hist2Copy;
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if (file2Name == "") {
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hist2Copy = (TH1*)file1->Get(hist2Name);
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if ( !hist2Copy ) {
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cout << file1Name << " does not contain " << hist1Name << endl;
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return;
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}
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outputName = outputFolder+"/"+file1Name+"-"+hist1Name+"-div-"+hist2name+outputType;
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} else {
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file2 = new TFile(file2Name);
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if ( !file2 ) {
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cout << file2Name << " does not exist." << endl;
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return;
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}
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hist2Copy = (TH1*)file2->Get(hist2Name);
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if ( !hist2Copy ) {
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cout << file2Name << " does not contain " << hist2Name << endl;
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return;
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}
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outputName = outputFolder+"/"+hist1Name+"-"+file1Name+"-div-"+file2Name+outputType;
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} // end of if file2 was chosen
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TH1* finalHist = hist1Copy->Clone();
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finalHist->Divide(hist1Copy,hist2Copy,scale1,scale2);
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finalHist->SetLineWidth(lineWidth);
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finalHist->SetStats(displayStatsBox);
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finalHist->Draw();
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outputName.ReplaceAll(".root",""); // remove ".root" from the output image name
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c1->Print(outputName); // Save the histogram to a file
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}
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