@Cris Luengo, filter2 is not a toolbox function, (I am not aware if it was earlier or not) and should be allowed now.
Strictly incomprehensible for me.
Well done :!
Really nifty!! ;-)
Make a checkerboard matrix
Distance walked 2D
Number of 1s in the Binary Representation of a Number
Rotate input square matrix 90 degrees CCW without rot90
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