The code for the Postscript and SetXTitle script

From: Matthias Vitt (vitt@imt.fzk.de)
Date: Wed Feb 19 1997 - 12:37:43 MET 

Hi Rene,

Well, Surely I put "TPostScript" as class identifier  in this script, since 
without I must have gotten an error. The file fff.ps is printed but not in 
8 cm x8 cm. It is still the default size. The Fit is done without any problems,
but I still get the "illelgal pointer to class GetHistogram()" error when I 
try to set the x-axis title.

So here's the code. It is bascically the tutorial graph.C. Maybe you find a gross error. (better hopefully you find
one , I really want to use root). Off course there is the possibility to set 
an axis title via a PaveText-object. But the other way would be more satisfying.

Thank you very much for your help.

	Mats

{
   gROOT->Reset();
 
   c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500);

   c1->SetFillColor(42);
   c1->SetGridx();
   c1->SetGridy();
   c1->GetFrame()->SetFillColor(21);
   c1->GetFrame()->SetBorderSize(12);

   Int_t n = 8;
   Float_t x[n], y[n];

   for (Int_t i=0;i<n;i++) {
     x[i] = i*0.5;
     y[i] = sin(x[i]+1);
     printf(" i %i %f %f \n",i,x[i],y[i]);
   }

   gr = new TGraph(n,x,y);
   gr->GetHistogram()->SetXTitle("x axis");
   gr->Fit("pol1");
   gr->SetFillColor(19);
   gr->SetLineColor(2);
   gr->SetLineWidth(4);
   gr->SetMarkerColor(4);
   gr->SetMarkerStyle(4);
   
   TPostScript mps("fff.ps");
   mps.Range(8,8);
   gr->Draw("AP");
   c1->Draw();
   mps.Close();
 
   c1->Modified();
}

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