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]
Prime factor digits
Concatenate two strings
Remove NaN ?
Duplicate each element of a vector.
First non-zero element in each column
vectorization in N
Create a matrix X, where each column is a shifted copy of the vector v
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