Flip the main diagonal of a matrix
Create a vector whose elements depend on the previous element
Create a vector
Find remainder when x is divided by 3
Function 1 (★)
Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
Doubling elements in a vector (★★)
Extract leading non-zero digit (★★★★★)
Create a vector of n alternating ones and zeros (★★)
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