Hi,
On Mon, 2 Dec 2002, Perfetto Francesco wrote:
> I thanks you for your suggestion, but I have yet a problem.
> Now I can define an array of TLorentzVector but remain me the problem to
> put it in a tree. Infact my declaration of tree with a branch of
> TLorentzVector (see below) still don't work
>
> TlorentzVector *p4_ph = new TLorentzVector[14] <<<<----This ok now
> ...
> TTree *res = new TTree("res","res di prova")
Unfortunately C pointers are very stupid. They don't know how much
elements the array contains. Imagine that I add
TLorentzVector *tlv = new TLorentzVector(0, 1, 2, 3);
res->Branch("tlv", "TLorentzVector", &tlv);
> res->Branch("p4_ph" ,"TLorentzVector" ,&p4_ph);
Do you see any way how TTree can separate this cases?
>
> Can you tell me where I mistake ?
You should use an intelligent container. For example
TClonesArray *tca = new TClonesArray("TLorentzVector", 7);
res->Branch("tca", "TClonesArray", &tca, 32000, 0);
//...
new ( (*tca)[0] ) TLorentzVector();
//...
( (TLorentzVector *)tca->At(0) )->SetX(5);
res->Fill();
tca->Clear();
...
> On Sat, 30 Nov 2002, Maksim A. Nikulin wrote:
..
> > I think you should create TClonesArray of TLorentzVector's or simple class
> > which contents C array of TLorenzVector's
...
Maksim Nikulin <M.A.Nikulin@inp.nsk.su>
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