Hi Daniel,
Did you really try my suggestion?
TLeaf *l_phioffset = t->GetLeaf(("phioffset");
double *phioffset = (double*)l_phioffset->GetValuepointer();
for (int i=0;i<nentries;i++) {
l_phioffset->GetBranch()->GetEntry(i);
cout<<phioffset[o], etc
}
On Fri, 29 Nov 2002, Daniel Holmes wrote:
> Hi Rene,
>
> hmm, no i don't think this was quite what i wanted (or i have not
> sufficiently understood it.
>
> In short what i have is a 2-D array (converted from hbook->root) stored in
> 1 leaf
> ie for each phioffset[i] (i=1->100) there are 1000 entries.. i need to be
> able to return any given entry for a given phioffset[i].
>
> ((if i do t->Draw("phioffset[3]"); then i get a 1-D histo with 1000
> entries))
>
> the code :
> TLeaf *l_phioffset = t->GetLeaf(("phioffset");
> l_phioffset->GetBranch()->GetEntry(5); //to read entry 5
> double phioffset = l_phioffset->GetValue();
>
> works fine for a 1-D array but in fact i need to be able to define an
> index of phioffset before i loop over its entries.
>
> If this was what you sent in your last email then perhaps you could
> clarify exactly how i should input the code as i don't seem to be able to
> run it without errors,..
>
> many thanks for your ongoing support,
>
> Dan.
>
>
>
> CMS-Bristol
> http://cern.ch/dan.holmes
>
> On Thu, 28 Nov 2002, Rene Brun wrote:
>
> > Hi Dan,
> >
> > You can do
> > double phioffset3 = l_phioffset->GetValue(3);
> > or
> > double *phioffset = (double*)l_phioffset->GetValuepointer();
> > and then access pihioffset[3];
> >
> > Rene Brun
> >
> > On Thu, 28 Nov 2002, Daniel Holmes wrote:
> >
> > > thanks Rene,
> > >
> > > How do i change the code below so i can read a 2-D, array.. i can plot :
> > > t->Draw("phioffset[3]"); using the "phioffset" leaf.
> > >
> > > cheers,
> > >
> > > Dan.
> > >
> > >
> > > > With your example, you can do
> > > > TLeaf *l_phioffset = t->GetLeaf(("phioffset");
> > > > l_phioffset->GetBranch()->GetEntry(5); //to read entry 5
> > > > double phioffset = l_phioffset->GetValue();
> > > >
> > > > Rene Brun
> > > >
> > >
> > >
> >
> >
>
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:51:21 MET