TF1

From: Thomas Hadig (hadig@toots.physik.rwth-aachen.de)
Date: Wed Sep 22 1999 - 10:47:59 MEST


Dear Rooters,

I have a problem with version ROOT 2.22 in drawing Functions (TF1) with
logarithmic scales.

The code included below works fine on version,
     *   Version   2.21/06  18 February 1999   *
but with version
     *   Version   2.22/10      28 July 1999   *
i get the following message
   Error in <TGraph::PaintGraphHist>: X must have N+1 values with option N
when the line y09->Draw("same") is executed. 
In addition, the line is not drawn up to the end.

Ciao and thanks in advance
Thomas

h1kine()
 {
  TCanvas *c = new TCanvas("a","");
  c->SetLogx();
  c->SetLogy();
  c->Draw();

  TH1F *h = new TH1F("d","d", 1, 0.0006, 0.4);
  h->SetMaximum(7000);
  h->SetMinimum(50);
  h->Draw("");

  // iso y lines
  TF1 *y09 = new TF1("y09","0.9*4*27.5*820*x",.0006158,.0862281);
  y09->SetLineWidth(1);
  y09->Draw("same");

  c->Update();
 }


Ciao
Thomas

----------------------------------------------------------------------------
Thomas Hadig, Ottensen, Donnerstr. 20, D-22763 Hamburg    (+49 40 39901186)
  office : I. Phys. Institut AAC, Room 1c354, Notkestr. 85, D-22607 Hamburg
           hadig@rwth-aachen.de                       Tel. +49 40 8998 2312
http://www-h1.desy.de/~hadig/                         FAX  +49 40 8998 4385
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