hi everybody, a question, as I can know the location (number) of an attribute with its name. Ej. X1 X2 X3 X4 X5 X6 1 3 5 2 1 7 6 7 4 5 2 9 as I can know that the attribute "X4" is in position 4 I hope you can help me from already thank you very much to all Agustín