Hello Jason,
My mistake - I cut and pasted out of my old example wrong.
Yours looks better.
Tim
On Fri, 6 Sep 2002, Jason Seely wrote:
> hey tim,
>
> thanks a lot. i think i have it working now. however, i had to make a
> couple modifications to what you sent me:
>
> Float_t p;
> (if t is you ntuple)
> t->SetBranchAddress("leafp",&p);
> Int_t nentries = t->GetEntries();
> Int_t nbytes = 0;
> Int_t i;
> for ( i=0; i<nentries;i++) {
> t->GetEntry(i);
> cout << p << endl;
> }
>
> so i'm a little confused about what you meant to do with 'nbytes'.
> anyway, thanks a lot for your help (oh, thanks to chi too.)
>
> have fun,
>
> jason
>
>
> Timothy Smith wrote:
> Hello Jason,
>
> It looks to me as if you root file is just a simple
> ntuple?
> If that is true then, I think, you read it like you can loops
> through an ntuple.
>
> Float_t p;
> (if t is you ntuple)
> t->SetBranchAddress("leafp",&p);
> Int_t nentries = n->GetEntries();
> Int_t nbytes = 0;
> Int_t i;
> for ( i=0; i<nentries;i++) {
> nbytes->GetEntry(i);
> cout << p << endl;
> }
>
> Tim
> On Fri, 6 Sep 2002, Jason Seely wrote:
>
> > hi eveyone,
> >
> > how's it going? i'm trying to figure out how to get the
> numerical value
> > of a leaf in a chain for a particular event. This seems
> like it should
> > be straightforward, but i can't find a member that does
> it. i would like
> > to be able to do something like this:
> >
> > TChain *t = new TChain("ntp");
> > t->Add("rootfile.root");
> >
> > Float_t p = t->GetValue("leafp",eventindex);
> >
> > does any one know an easy way to do this?
> >
> > thanks,
> >
> > jason
> >
> > --
> >
> --------------------------------------------------------------------
> > jason seely
> > 26.650.b
> > massachusetts institute of technology
> > 77 massachusetts avenue
> > cambridge, ma 02139-4307
> >
> > email: seely@mit.edu
> > phone: 617.253.4772/6734
> > html: web.mit.edu/seely/www
> >
> --------------------------------------------------------------------
> >
> >
>
> --
> ____________________________________________________________________
> Timothy Paul Smith Assistant Research
> Professor
> still using my MIT email for now ->
> tim_smith@mit.edu
> no voice mail yet -> tel: (603)
> 646-9346
> Dartmouth College
> Department of Physics and Astronomy
> 6127 Wilder Lab.
> Hanover, New Hampshire 03755
>
> --
> --------------------------------------------------------------------
> jason seely
> 26.650.b
> massachusetts institute of technology
> 77 massachusetts avenue
> cambridge, ma 02139-4307
>
> email: seely@mit.edu
> phone: 617.253.4772/6734
> html: web.mit.edu/seely/www
> --------------------------------------------------------------------
>
>
--
____________________________________________________________________
Timothy Paul Smith Assistant Research Professor
still using my MIT email for now -> tim_smith@mit.edu
no voice mail yet -> tel: (603) 646-9346
Dartmouth College
Department of Physics and Astronomy
6127 Wilder Lab.
Hanover, New Hampshire 03755
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