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Thanks you very much William, now work!!!!! I am going to read the reference you suggest.
Hello, now seem work. The random array is recalculate only when n change and not when t change, [mcode]ClearAll["n", "t", "a"] Manipulate[currN = n; a = If[(currN == lastN), a, Table[RandomInteger[{0, 100}], {i, 1, n}]]; lastN = currN;...