What is Cross-Correlation?

Do you remember when school kids simply lined up according to height before heading to the library or to gym class? Shortest in the front. Tallest in the back. A quick glance forward and backward is all anyone needed to do to more or less confirm his or her place in the queue. Any outlier (generally the class clown) could be identified and adjusted quickly by the teacher.  Wouldn’t it be nice if the process for isolating and correcting controller issues was that simple?

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