Re: TPaveStats and Divide

Hi,
I am a beginner in ROOT, and have earlier done computing in FORTRAN. I had started with PAW, but after learning the preliminaries in it, my advisor is pushing me to learn ROOT, as that is what everybody uses now. Since I have not worked with C++, so am having a bit of trouble understanding the general tutorial uploaded on the website. Can you suggest me a way out, is there a book for me to start with! or can somebody send me an example file which is good for someone to understand the very beginning.

Thanks in Anticipation.
Cheers,
Amrendra

On Sat, Apr 19, 2008 at 5:55 PM, Manuel Mussini <Manuel.Mussini_at_bo.infn.it> wrote:

> Great! It works!
>
> Thanks!
>
> Bye...
>
> > -----Original Message-----
> > From: owner-roottalk_at_lxbuild091.cern.ch [mailto:owner-
> > roottalk_at_lxbuild091.cern.ch] On Behalf Of Rene Brun
> > Sent: Saturday, April 19, 2008 14:48
> > To: Manuel Mussini
> > Cc: roottalk_at_lxbuild091.cern.ch
> > Subject: Re: [ROOT] TPaveStats and Divide
> >
> > Do:
> >
> > fMCVerticesCanvas = new TCanvas("MCVerticesCanvas", "MC Vertices", 0, 0,
> > 1100, 1100);
> >
> > fMCVerticesCanvas->Divide(2, 2);
> >
> > fMCVerticesCanvas->cd(1);
> >
> > fMCVerticesCanvas->cd(1)->SetLogy();
> >
> > fVerticesClass->Draw();
> >
> > fMCVerticesCanvas->Update();
> > ((TPaveStats
> > *)fVerticesClass->GetListOfFunctions()->FindObject("stats"))-
> > >SetOptStat(1111);
> >
> >
> >
> > Rene
> >
> >
> >
> > Manuel Mussini wrote:
> > >
> > > Hi,
> > >
> > > I have a script that:
> > >
> > > - sets a global style using gStyle->SetOptStat(11)
> > >
> > > - opens a root file
> > >
> > > - gets some TH1D
> > >
> > > - creates a canvas
> > >
> > > - divides the canvas in 4 (2x2)
> > >
> > > - draws a histo in each subcanvas
> > >
> > > - saves the canvas in a eps file
> > >
> > > Now the problem! How to change the OptStat options only for the first
> > > histo?
> > >
> > > I've searched for it on the web site but this solution doesn't fix the
> > > problem in my script:
> > >
> > > fMCVerticesCanvas = new TCanvas("MCVerticesCanvas", "MC Vertices", 0,
> > > 0, 1100, 1100);
> > >
> > > fMCVerticesCanvas->Divide(2, 2);
> > >
> > > fMCVerticesCanvas->cd(1);
> > >
> > > fMCVerticesCanvas->cd(1)->SetLogy();
> > >
> > > fVerticesClass->Draw();
> > >
> > > ((TPaveStats
> > > *)fVerticesClass->GetListOfFunctions()->FindObject("stats"))-
> > >SetOptStat(1111);
> > >
> > > The tricky point is that if I try this interactively it works!!!
> > >
> > > Running from the script I get:
> > >
> > > Error: illegal pointer to class object
> > > (TPaveStats*)fVerticesClass->GetListOfFunctions()->FindObject("stats")
> > > 0x0 638 C:\root\ManuC\THeavyFlavoursAllPlots.C(198)
> > >
> > > I'm running 5.17.02 on WinXP!
> > >
> > > Bye.
> > >
>
>
>

-- 
Amrendra Narayan
Graduate Student
Hilbun Hall, Room # 045 B
Mississppi State University
Starkville, MS-39762
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