I made some progress with the program but I still don't how do I make the
root read de sequence of numbers.
for example:
0 1 2 3 Let's supose the 1º column is call p
1 3 4 5 2º column is call d
2 3 4 6 3º column is call c
2 7 9 0 4º column is call s
2 2 4 5
2 3 4 8
2 5 6 0
How do I do to make the ROOT recognise that the 1º column is p the 2º is d
......
Fernando Amaral