Re: Problem with TGraph

From: Olivier Couet <Olivier.Couet_at_cern.ch>
Date: Mon, 3 Apr 2006 15:26:49 +0200 (CEST)

Hi,

I do not see such problem on my linux machine:

---

pcepsft15.cern.ch> root -n

---

• *
• W E L C O M E to R O O T *
• *
• Version 5.11/01 3 March 2006 *
• *
• You are welcome to visit our Web site *
• http://root.cern.ch *
• *

  ---

FreeType Engine v2.1.9 used to render TrueType fonts. Compiled on 3 April 2006 for linux with thread support.                                                                                 

CINT/ROOT C/C++ Interpreter version 5.16.10, March 30, 2006 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0] .! cat tv.C
{

  TVectorD v1,v2;
  v1.ResizeTo(2);
  v2.ResizeTo(2);
  for( int i = 0; i < v1.GetNrows(); ++i ) {

    v1[i] = i;
    v2[i] = 2.0001e8;
  }
  TGraph* gr = new TGraph(v1,v2);
  gr->Draw("A*");
}
root [1] .x tv.C
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1 root [2]

---

 It doesn't hang and I get the plot.

 Cheers, O.Couet

On Mon, 3 Apr 2006, Hajo Molegraaf wrote:

> Hi,
> The following macro gets my root to hang:
> 
> TVectorD v1,v2;
> v1.ResizeTo(2);
> v2.ResizeTo(2);
> for( int i = 0; i < v1.GetNrows(); ++i )
> {
>    v1[i] = i;
>    v2[i] = 2.0001e8;
> }
> TGraph* gr = new TGraph(v1,v2);
> gr->Draw("A*");
> 
> If I change the '2.0001e8' into '2e8' or smaller, it works. Any larger value
> gives this problem.
> 
> root version:
> Version   5.11/01      3 March 2006
> Compiled on 3 April 2006 for linux with thread support.
> CINT/ROOT C/C++ Interpreter version 5.16.10, March 30, 2006
> 
> What am I doing wrong?
> 
> Hajo Molegraaf.
> 
> _________________________________________________________________
> Nieuw op MSN Messenger 7.5: Dynamische achtergronden
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> 

-- 
Org:    CERN - European Laboratory for Particle Physics.
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Received on Mon Apr 03 2006 - 15:26:55 MEST