Reindex a vector
Detect a number and replace with two NaN's
Narcissistic number ?
Back to basics - mean of corner elements of a matrix
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Create a matrix X, where each column is a shifted copy of the vector v
A quadrant matrix
Matrix which contains the values of an other matrix A at the given locations.
Matrix with different incremental runs
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