Input x is the sampled signal vector, may have both AC and DC components. output vector y should have AC components removed then change sign alternately, for example, input [1:5], output [3 -3 3 -3 3].
Could you be a bit more specific about the specs? What exactly are we supposed to do here?
Tic Tac Toe FTW
Multiply a column by a row
Side of an equilateral triangle
Looking for Squares
speed vs size
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