Very creative usage of blkdiag in collaboration with conv2. I prefer nnz over "any" for speed and compactness.
Sum of diagonal of a square matrix
frame of the matrix
Polite numbers. Politeness.
Find the nearest prime number
SET (the card game)
Assign matrix rows/columns to separate variables
Triangular matrices in 3D array
Find the maximal cliques in an undirected graph
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