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].
Swap the input arguments
Find number of days
Rotate input square matrix 90 degrees CCW without rot90
06 - Matrix Equations 1
Area of a triangle
Distance walked 1D
speed vs size
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