Write a function that accepts as input a vector and returns the same vector, but retaining only the first occurrence of an element whenever there is consecutive repetition of this element.
in -> [1 2 2 2 3 4 4 3 5]
out-> [1 2 3 4 3 5]
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vectorization in N
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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Create a matrix X, where each column is a shifted copy of the vector v
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