Reinhardt,
I do not understand your request!
If you read an ntuple entry with variables "norm" ,"pdid" and "pixid"
I do not see how you can correlate
(norm for pixid==0 and pdid=0) against (norm for pixid=0 and pdid=37)
By definition, the two cases are mutually exclusive.
Rene Brun
Thu, 11 Apr 2002, Reinhardt Chamonal
wrote:
> Hi Rene,
> I would be happy with the first case but
> I mean (norm for pixid==0 and pdid=0) against (norm for pixid=0 and
> pdid=37)
> So if I want to do let's say x versus y I do
> h10->Draw("x:y"), easy but what about my case where I need x versus x with
> 2 different options... ? Is it possible ?
> I guess I can't do that. Thus I would need to extract the data from the
> ntuple to put it on a 2d histogram...
> Cheers
>
> On Thu, 11 Apr 2002, Rene Brun wrote:
>
> > Hi Reinhardt,
> >
> > What do you mean by
> > "plot norm for pdid=0 and pixid=1 against norm for pdid=0"
> >
> > Do you mean :Superimposing two histograms obtained with
> > different selection criteria?
> > A scatter-plot? of what versus what?
> >
> > Assuming you mean the first case, you can do:
> > h10->Draw("norm","pdid==0 && pixid==1");
> > h10->Draw("norm","pdid==0 && pixid==37","same");
> >
> > Rene Brun
> >
> > On Thu, 11 Apr 2002, Reinhardt Chamonal wrote:
> >
> > > Hi,
> > > As I am still a starter at root I still have basic questions...
> > > I am trying to plot one ntuple variable against the same one but with
> > > different parameters..
> > > So I have a variable called norm which depends on pdid and pixid.
> > > For example I can plot norm for pdid=0 and pixid=0 using the following
> > > way:
> > > h10->Draw("norm","pdid==0 && pixid==1");
> > > A second histogram could be:
> > > h10->Draw("norm","pdid==0 && pixid==37");
> > > Now I would like to basically plot the two histograms againt one
> > > another..ie plot norm for pdid=0 and pixid=1 against norm for pdid=0 and
> > > pixid=37.
> > > I am ok doing so for the same parameters but different variables, but
> > > here I have the same variable against different parameters. To do so can I do
> > > something like ?
> > > h10->Draw("norm:norm","pdid==0 && pixid==1","pdid==0 && pixid==1");
> > > or is it better to read the data and fill a 2D histogram or a compare
> > > directly the 2 histograms...
> > > Otherwise how do I do ?
> > >
> > > Hope you understood my problem wasn't easy to explain...
> > > Cheers.
> > >
> >
>
> --
> ------------------------------------------------------------
> Reinhardt CHAMONAL The University of Edinburgh
> Dept. of Physics & Astronomy
> email: chamonal@ph.ed.ac.uk King's Buildings, JCMB, 5301
> Mayfield Road
> phone: +44-131-650 5307 Edinburgh, EH9 3JZ
>
> web: http://www.ph.ed.ac.uk/~chamonal/
> http://www.reuh.fr.st
> ------------------------------------------------------------
>
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