Back to basics 21 - Matrix replicating
Create a vector with n repeated values of a number x (★★)
Mo money, mo math 1! (★★★)
Sum of elements in a vector (★)
Select every other element of a vector (★★)
Get the elements of diagonal and antidiagonal for any m-by-n matrix (★★★★)
Matrix with increasing numbers (★★★★)
Sum of terms in a series 1 (★★★)
Average of corner elements of a matrix (★★)
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