Not sure where the 'vectorization' is coming from for this problem.
Extract leading non-zero digit
Factorize THIS, buddy
Omit columns averages from a matrix
Triangle Numbers Below N
Matrix which contains the values of an other matrix A at the given locations.
Remove NaN ?
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Duplicate each element of a vector.
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