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Thank you very much Kuba!! It's exactly what I was looking for! Thank you again!
Okey Henrik, you have been a great help, thank you very much for your response!
Thanks for your response, Kuba. Regrettably, I have not been able to understand what you have tried to explain me...I don´t know exactly what I have to do with the part of code you show. Thanks anyway!
Thank you for your response, Abraham, but It´s not exactly what i am lookig for. I need only one controller "a". "t" and "z" are the variables which depends of "a".
Thank you for your response, Gianluca. I tried to do what you show me, but I couldn't get the result I am looking for. I show the code and a picture with my code and the result I obtained...maybe someone find the mistake. A = {{1, 1, 1},...
Thank you for your response Udo, it was useful.
It was a silly mistake for my part. Thank you very much for the aclaration!