Not sure where the 'vectorization' is coming from for this problem.
Which values occur exactly three times?
Create a square matrix of multiples
Number of 1s in a binary string
Generate a NaN...on purpose
Area of an Isoceles Triangle
Remove NaN ?
A quadrant matrix
Matrix which contains the values of an other matrix A at the given locations.
Create a matrix X, where each column is a shifted copy of the vector v
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