newly added. Not for productive used yetsvn diff | grep Index:

src/tests/rootFiles/histoWithErrors.C

@@ -0,0 +1,30 @@
+{
+  TFile f("test.root", "recreate");
+
+  // make a histo with errors
+  TH1F *h  = new TH1F("h", "histo test", 20, -0.05, 1.05);
+  TH1F *hc = new TH1F("hc", "curve", 20, -0.05, 1.05);
+  for (unsigned int i=0; i<20; i++) {
+    x = (double)i/20.0;
+    value = TMath::Sqrt(1.5*x+0.1*TMath::Power(x,3.0)-0.4*TMath::Power(x,5.0));
+    hc->SetBinContent(i, value+0.1*TMath::Sqrt(value)-value*value);
+    h->SetBinContent(i, value);
+    h->SetBinError(i, TMath::Power(value, 5.0));
+  }
+
+  TCanvas *c1 = new TCanvas("c1", "my Canvas c1", 10, 10, 800, 600);
+
+  h->SetMarkerStyle(20);
+  h->Draw("*H HIST E1");
+
+  hc->SetLineColor(2);
+  hc->SetLineWidth(3);
+  hc->Draw("C SAME");
+
+  TCanvas *c2 = new TCanvas("c2", "my Canvas c2", 10, 10, 800, 600);
+  h->SetMarkerStyle(23);
+  h->Draw("*H HIST E1");
+
+  f.WriteTObject(c1);
+  f.WriteTObject(c2);
+}