Pity that eval is forbidden - I had quite an elegant solution using it.
Back to basics 9 - Indexed References
Flip the main diagonal of a matrix
Given a window, how many subsets of a vector sum positive
Matrix with different incremental runs
Wayfinding 1 - crossing
Create a random logical vector of N elements of which M are true.
Bleed non-zeros to the right
Wrap a vector, but insert NaN's at the wrap-positions.
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