Hello root expert,
I have two problems that you might help.
Let's say I have a class as following:
class myclass:public TObject{
float x,y,z;
}
if I store the class object via TClonesArray in a tree at split level 2,
when I use MakeClass functions, individual variables x,y,z will appear in
the code. But I really want to have only the pointer to the class in the
code. I know this can be done if I save the object at split level <0, but
since in PHENIX a lot of DSTs have been produced with split level 2. My
question is : Is it possible to convert a Tree produced at split level >0
to a tree with split level<0, so the source code produced by MakeClass
will only contains pointers to the TObject instead of pointers to the
individual varibles of the class?? This will be a very nice feature of
Tree!
My second question is that Is it possible to merge severl Ntuples together
with some cut applied? I search through root digest and can't find any
solution. This will be very nice because it can shink Ntuple size by huge
factor.
Thanks,
Jiangyong
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