Daniel,
Sorry for the typo.
GetValuePointer, not GetValuepointer
Rene Brun
On Fri, 29 Nov 2002, Daniel Holmes wrote:
> yes, i do:
>
> (//my 2-D array is really called "Tbextal" ..i just used the name of the
> 1-D array i had from my last question for example purposes)
>
> root [5] TLeaf *l_phioffset = t->GetLeaf("Tbextal");
> root [6] double *phioffset = (double*)l_phioffset->GetValuepointer();
>
> ..then i get:
>
> Error: Can't call TLeaf::GetValuepointer() in current scope
> FILE:/tmp/fileESpzPC_cint LINE:1
> Possible candidates are...
> filename line:size busy function type and name (in TLeaf)
> filename line:size busy function type and name (in TNamed)
> filename line:size busy function type and name (in TObject)
> Error: Symbol l_phioffset is not defined in current scope
> FILE:/tmp/fileESpzPC_cint LINE:1
> Error: Failed to evaluate l_phioffset->GetValuepointer()Possible
> candidates are...
> filename line:size busy function type and name
> *** Interpreter error recovered ***
>
>
>
> CMS-Bristol
> http://cern.ch/dan.holmes
>
> On Fri, 29 Nov 2002, Rene Brun wrote:
>
> > 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
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> >
> >
>
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