Pity that eval is forbidden - I had quite an elegant solution using it.
Replace Vector Elements
Magic is simple (for beginners)
Mirror Image matrix across anti-diagonal
Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...
Create a random logical vector of N elements of which M are true.
Wayfinding 4 - Crossing, level 2
Add a row of zeros on top of a matrix
Wrap a vector, but insert NaN's at the wrap-positions.
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