Hi,
If you persist running with the old version, you can do:
char expression[100];
sprintf(expression,"diff_E_p4[%d]",i);
res->Draw(expression);
Rene Brun
On Wed, 11 Dec 2002, Perfetto Francesco wrote:
> Hi Rene,
>
> Thanks for your help, but still don't work, now root - after the command
> .x prova.C - tell me:
>
> Limitation: Variable argument is not supported for this platform
> FILE:risol.C LINE:38
>
> *** Break *** floating point exception
> Root >
>
> Can you help me again ?
>
> I use root 3.02/07 on sun SPARC 5.6
>
> Ciao, Francesco.
>
> On Wed, 11 Dec 2002, Rene Brun wrote:
>
> > Hi,
> >
> > What you do is illegal C++. TTree::Draw expects a valid string.
> > You can do:
> >
> > res->Draw(Form("diff_E_p4[%d]",i));
> >
> > Rene Brun
> >
> > On Wed, 11 Dec 2002, Perfetto Francesco wrote:
> >
> > > Hi all,
> > >
> > > I have a tree with any variables; any of these variables are array, I
> > > would like to know if there is an easy mode for draw it (for example in a
> > > cycle for).
> > > I make this but it don't work
> > >
> > > TFile *f = new TFile("analisi_mc_prova.root","r");
> > >
> > > for(Int_t i=0;i<7;i++)
> > > res->Draw("diff_E_p4[i]"); <<---diff_E_p4 is an array of double
> > >
> > > when run .x prova.C root tell me:
> > > ERROR 26 :
> > > Unknown name : "i"
> > >
> > > Ciao, Francesco.
> > >
> >
> >
>
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