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?
Angle between two vectors
Getting the absolute index from a matrix
Generate a string like abbcccddddeeeee
How many jokers?
length of a vector
Filter AC, pass DC
Check if any duplicates in your data
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