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

src/tests/root2DHisto/root2DHisto.C

@@ -0,0 +1,24 @@
+{
+  gStyle->SetOptStat(000000000);
+
+  TCanvas *cov = new TCanvas("cov", "Minuit2 Output Covariance Matrix", 500, 500);
+
+  TH2D *f = new TH2D("f", "Minuit2 Output Covariance Matrix", 16, 0.0, 16.0, 16, 0.0, 16.0);
+
+  double x, y, z;
+
+  for (unsigned int i=0; i<16; i++) {
+    for (unsigned int j=0; j<16; j++) {
+      x = (double)i;
+      y = (double)j;
+      z = x/16.0-y/16.0+(x-8.0)*(y-8.0)/(8.0*8.0);
+      f->Fill(x,y,z);
+    }
+  }
+
+  TFile ff("test.root", "recreate");
+  cov->Draw();
+  f->Draw("COLZ");
+  cov->Write();
+  ff.Close();
+}