Given a matrix M and two index vectors a and b, return a row vector x where x(i) = M(a(i),b(i)).
Project Euler: Problem 6, Natural numbers, squares and sums.
Check if number exists in vector
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Make a 1 hot vector
Vectors counting by 2
middleAsColumn: Return all but first and last element as a column vector
Set a diagonal
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