Sorted highest to lowest?
Back to basics 9 - Indexed References
Set the array elements whose value is 13 to 0
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
First non-zero element in each column
Find the elements of a matrix according to a defined property.
Remove NaN ?
Create a matrix X, where each column is a shifted copy of the vector v
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