SSsample
Built-in function: This function is used in the semi-deterministic SS algorithm, and it contains two parameters X and Y, both of which are in an increased order. All data points in X vector that have not appeared in Y vector will be recorded and returned by this function.
remainUnsample(X, Y)
A vector containing the remaining data that are not in Y.
A vector that needs to be sampled.
A vector with data samples from X.