Hi Chris,
On Wed, 18 Sep 2002, Christopher B. Lirakis wrote:
> Hi Rene,
> This will fill directly from an Ntuple?
Not fully automatic. See
http://root.cern.ch/root/htmldoc/TTreePlayer.html#TTreePlayer:DrawSelect
and look at section "How to obtain more info from TTree::Draw"
example, assuming a Tree with variables u,v,w
if you do: tree.Draw("v:u","w>.5"), for example
this will fill internal Tree cache structures that you can retrieve
to build a TGraph* gr.
gr = new TGraph(tree->GetSelectedRows(),tree->GetV2(),tree->GetV1();
now you can draw with your graph with, eg
gr->Draw("alp");
An option could be added to TTree::Draw to do this automatically.
Rene Brun
>
Chris
> >X-Authentication-Warning: pcroot.cern.ch: majordomo set sender to
> >owner-roottalk@root.cern.ch using -f
> >Date: Wed, 18 Sep 2002 15:07:30 +0200 (METDST)
> >From: Rene Brun <Rene.Brun@cern.ch>
> >To: "Christopher B. Lirakis" <clirakis@bbn.com>
> >cc: roottalk@pcroot.cern.ch
> >Subject: Re: [ROOT] Stupid Scatterplot question.
> >Sender: owner-roottalk@pcroot.cern.ch
> >
> >Hi Chris,
> >
> >Use a TGraph instead of a scatter-plot and plot your graph
> >with the options "lp" or "alp" if you want to compute the frame range
> >automatically.
> >
> >Rene Brun
> >
> >On Wed, 18 Sep 2002, Christopher B. Lirakis wrote:
> >
> > > If I am plotting a series of (x,y) pairs of points, is there an option to
> > > connect adjacent points with a line segment when plotting?
> > > Regards
> > > Chris
> > >
> > > -Christopher B. Lirakis, Phd
> > > -High Performance Computing
> > > -BBN Technologies
> > > -127 John Clarke Rd
> > > -Middletown, RI 02842
> > > -
> > > -(401) 849-2543 (voice) - Front Desk
> > > -(401) 848-3537 (voice) - Direct Line.
> > > -(401) 849-8611 (fax)
> > > -(401) 788-4607 (cell)
> > > -(401) 872-5689 (Pager)
> > > -
> > > -http://www.gte.com/AboutGTE/gto/bbnt/
> > >
>
> -Christopher B. Lirakis, Phd
> -High Performance Computing
> -BBN Technologies
> -127 John Clarke Rd
> -Middletown, RI 02842
> -
> -(401) 849-2543 (voice) - Front Desk
> -(401) 848-3537 (voice) - Direct Line.
> -(401) 849-8611 (fax)
> -(401) 788-4607 (cell)
> -(401) 872-5689 (Pager)
> -
> -http://www.gte.com/AboutGTE/gto/bbnt/
>
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