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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