Re: [ROOT] How to get the histogramm after the TChain->Draw method.

From: Cyril Lachaud (lachaud@lpnax1.in2p3.fr)
Date: Mon Nov 20 2000 - 20:15:34 MET


Hi again,

thank you for the answer... but I'm still not satisfied...

Here is my code:

fFiles_chained->Draw("variable");
fHCanvas->Update(); // it gives me the good histogramm : htemp
TH1F *htemp;
htemp->SetXTitle("toto");

The last command gives the following error:
 *** Break *** segmentation violation 

If you have the answer...

Cyril Lachaud.


On Mon, 20 Nov 2000, Rene Brun wrote:

> Hi Cyril,
> 
> If htemp is in your current pad gPad, from the command line, you can do:
>  htemp->GetXaxis()->SetTimeDisplay(1);
>  htemp->GetXaxis()->SetTimeFormat("some format");
> 
> Rene Brun
> 
> Cyril Lachaud wrote:
> > 
> > Hi Rooters,
> > 
> > I'm working on a shared library (so not "in line").
> > 
> > I would like to know how to access to the histo filled after the
> > TChain->Draw method... (to modify axis for time format for example).
> > 
> > As far as I know this histo is called by default "htemp". But how can I do
> >  htemp->GetXaxis->SetTimeFormat() ?
> > 
> > Thank you.
> > 
> >  Cyril Lachaud
> 



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