Hi Stanislav,
I thanks you for your help, I have do that you tell me, but not even this
work.This time root tell me:
Compiled for solaris.
CINT/ROOT C/C++ Interpreter version 5.15.21, Dec 8 2001
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0] .L ana_dali_mc.C
root [1] ana_dali_mc mio
root [2] mio.Loop()
Error: Illegal Assignment to an undeclared symbol TLorentzVector&x
FILE:ana_dali_mc.C LINE:304
*** Interpreter error recovered ***
root [3]
On Wed, 25 Sep 2002, Stanislav NESTEROV wrote:
>
> Hi Perfetto,
> You should replace your line
>
> > Double_t delta_egamma(TLorentzVector x,TLorentzVector y)
>
> with
>
> > Double_t delta_egamma(TLorentzVector& x,TLorentzVector& y)
>
>
> and all will be fine.
>
> Best regards,
> Stanislav.
>
> On Wed, 25 Sep 2002, Perfetto Francesco wrote:
>
> > Hi ROOTers,
> > I am sorry if this question is very too trivial, but I don't know where
> > mistake.
> > The problem is that, when call the my function "delta_egamma" in my
> > program ,root tell me :
> >
> > root [0] .L ana_dali_mc.C
> > root [1] ana_dali_mc mio
> > root [2] mio.Loop()
> > Error: Illegal Assignment to an undeclared symbol TLorentzVectorx
> > FILE:ana_dali_mc.C LINE:304
> > *** Interpreter error recovered ***
> >
> > My program is:
> >
> > #define ana_dali_mc_cxx
> > #include "ana_dali_mc.h"
> >
> > void ana_dali_mc::Loop()
> > {
> >
> > if (!TClassTable::GetDict("Physics")) {
> > gSystem.Load("$ROOTSYS/lib/libPhysics.so");
> > }
> > ...
> > Double_t pluto;
> > TLorentzVector p4datetasys_pim,p4datetasys_pip,p4datetasys_piz;
> > TTree *tmc = new TTree("tmc","Tree for montecarlo");
> >
> > for (Int_t jentry=0; jentry<nentries;jentry++)
> > { ...
> > pluto = delta_egamma(p4datetasys_pip,p4datetasys_pim);
> > tmc ->Fill();
> > }
> > }
> >
> > Double_t delta_egamma(TLorentzVector x,TLorentzVector y)
> > {
> > Double_t delta;
> > TLorentzVector pippo;
> >
> > pippo = x;
> > mimmie= y;
> > ...
> > delta = pippo.Mag2();
> >
> > return delta;
> > }
> >
> > Someone can tell me how can I do that ?(where is my mistake ? )
> >
> > Regards
> > Francesco.
> >
> >
>
>
>
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