Thank you @couet! yes … few days ago, @Wile_E_Coyote explained me that to run this macro we have to do
root [0] .L TBAlign.c++g
root [1] TBAlign t
root [2] t.Loop();
He explained me the reason here Particle direction
I also didn’t know it, because my supervisor’s colleague gave me the original macro and I’ve to modify it…but he didn’t say me how to run the macro…