[ROOT] Editing TGraph Draw Options in Root Batch mode

From: Thomas Feser (tfeser@student.physik.uni-mainz.de)
Date: Wed Feb 28 2001 - 21:32:35 MET 

Hi all,

  I'm still struggling with TGrap objects. The current problem is:

  I want to read several TGraph object from a file, draw them in a
specified X-Axis range to write them into an .eps file. 
  I'm doing the following:

  graph[1] = (TGraphErrors*) myfile->Get("name_of_graph_no_1");
  mypad->cd();
  graph[1]->Draw("AP");
  mypad->Modified(kTRUE);
  myPad->Update();

  and now, to get access to the Xaxis, I say

  TH1F *h = TGraph->GetHistogram();

  because I want to do something like

  h->SetRange(...);

  However, the returned pointer h is NULL.

  Is there maybe a different method to change a graphs axis? Or am I
missing a neccessary command to get the histogram inside the graph
created?

  Thanks & Cheers,
  _
  |om


------------------------------------------------------------------------
-     Thomas Feser                                                     -
-                                                                      -
-     Institut fuer Physik                phone: +49-6131-39-25165     -
-     ETAP/AMANDA                           fax: +49-6131-39-25169     -
-     Staudingerweg 7 / 04-426                                         -
-     D-55099 Universitaet Mainz                                       -
-                                                                      -
-     Thomas.Feser@uni-mainz.de                                        -
-     http://iphcip1.physik.uni-mainz.de/~tfeser                       -
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