You added a few primes in each iteration... Very nice!
We love vectorized solutions. Problem 1 : remove the row average.
Create Volcano (or Atoll) martix. It is an extension of Bullseye matrix problem.
Matrix to column conversion
Approximation of Pi
Getting the indices from a matrice
Permute diagonal and antidiagonal
How to reverse spdiags ?
Negation and new variables
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