First non-zero element in each column
Rotate a matrix for 180 degree
Find the sum of n squares
Sum of terms in a series 1 (★★★)
Approximate functions 1 (★★★)
Create a vector with n repeated values of a number x (★★)
Sum of elements of a vector (★★★)
Function 1 (★)
Remove the row average (★★★)
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