Re: Problem with TGraph

From: Hajo Molegraaf <hjausenet_at_hotmail.com>
Date: Mon, 03 Apr 2006 18:42:34 +0200

Wow, I tried it again but nope: it hangs. My processor is (according to top) 99% busy with root.exe and I see no plot. It does say <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 but only an empty canvas is shown. If I press CTRL-C twice the canvas shows only the x-axis (from 0 to 1.2) and I get the messages:

• Break *** keyboard interrupt :0:
• Break *** keyboard interrupt Root >

Hajo.

>From: Olivier Couet <Olivier.Couet_at_cern.ch>
>To: Hajo Molegraaf <hjausenet_at_hotmail.com>
>CC: roottalk_at_pcroot.cern.ch
>Subject: Re: [ROOT] Problem with TGraph
>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.
> >
> > _________________________________________________________________
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> >
> >
>
>--
>Org: CERN - European Laboratory for Particle Physics.
>Mail: 1211 Geneve 23 - Switzerland Mailbox: J25910
>E-Mail: Olivier.Couet_at_cern.ch Phone: +41 22
>7676522
>WWW: http://cern.ch/Olivier.Couet/ Fax: +41 22
>7670300
>

---

Een audiogesprek? Pak Messenger, niet de telefoon http://www1.imagine-msn.com/Messenger/Video.aspx Received on Mon Apr 03 2006 - 18:42:44 MEST