I'm trying to create a class using MakeClass (following the example in the User's Guide, page 274), and the following commands show this: root [0] TFile *f = new TFile ("PhRot31.root"); root [1] f->ls(); TFile** PhRot31.root TFile* PhRot31.root KEY: TNtuple rt_NTuBegin;1 Initial Beam KEY: TNtuple RTTraces0;1 Trace for Event 0 KEY: TNtuple RTTraces1;1 Trace for Event 1 KEY: TNtuple RTTracRefPart2;1 Trace for Refrence particle KEY: TNtuple rt_NTu0;1 Sol Grid, Period 0 KEY: TNtuple rt_NTu1;1 Sol Grid, Period 1 KEY: TNtuple rt_NTu2;1 Sol Grid, Period 2 KEY: TNtuple rt_NTu3;1 Sol Grid, Period 3 KEY: TNtuple rt_NTu4;1 Sol Grid, Period 4 KEY: TNtuple rt_NTu5;1 Sol Grid, Period 5 KEY: TNtuple rt_NTu6;1 Sol Grid, Period 6 KEY: TNtuple rt_NTu7;1 Sol Grid, Period 7 KEY: TNtuple rt_NTu8;1 Sol Grid, Period 8 KEY: TNtuple rt_NTu9;1 Sol Grid, Period 9 KEY: TNtuple rt_NTu10;1 Sol Grid, Period 10 KEY: TNtuple rt_NTu11;1 Sol Grid, Period 11 KEY: TH1F TestBx;1 Bx at X = 0 , Y = 0, ZAver = 110000 KEY: TH1F TestBy;1 By ar X = 0 , Y = 0, ZAver = 110000 KEY: TH1F TestBz;1 Bz vs Z at X = 0 , Y = 0, ZAver = 110000 In the example given, they generate a class from a tree. Since I don't see a tree in the list above, but I know that I want the loop created to loop through the ntuples listed above, do I need to create a tree from these ntuples before I can run the tree->MakeClass("MyClass") command? If so, how? Thank you, Nancy Keuss
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