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A matrix is a list of numbers arranged in a rectangle with rows and columns. In programming, it is also known as a 2D array. Use this tag if your challenge is about manipulating matrices.

3
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CJam, 13 bytes 3,:(2m*{2b},` Try it online! Explanation 3, e# Range [0,3): [0 1 2] :( e# Decrement each: [-1 0 1] 2m* e# Cartesian square: [[-1 -1] [-1 0] [-1 1] [0 -1] [0 0] [0 …
answered May 14 '18 by Esolanging Fruit
0
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CJam, 22 bytes ri__*,:)/2/z[1W].{%:p} Try it online!
answered Mar 1 '18 by Esolanging Fruit