Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.
Find the numeric mean of the prime numbers in a matrix.
Getting the absolute index from a matrix
Output any real number that is neither positive nor negative
select the primes of a vector
Swap two numbers
How to reverse spdiags ?
Find indices of diagonal elements
Two functions (to be sure)
Permute diagonal and antidiagonal
Decrypt the cypher using XOR encryption (for beginners)
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