So let's say that x is a vector, for example, x = [4, 4, 5, 5, 5, 6, 7, 7，8, 8, 8, 8]

Now we want to get the following two vectors, l = [2, 3, 1, 2, 4]; The number of repeats per element of x.

v = [4, 5, 6, 7, 8]; The value of repeating elements in x.

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Chris Cleveland Riccardo G. Alexander Ross Lorenzo

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