In signal processing, cross-correlation is a measure of similarity of two waveforms as a function of a time-lag applied to one of them. This is also known as a sliding dot product or inner-product. It is commonly used to search a long duration signal for a shorter, known feature. It also has applications in pattern recognition, single particle analysis, electron tomographic averaging, cryptanalysis, and neurophysiology.
This is a script and not a function, therefore you cannot define input arguments. The values are obtained by INPUT, which has a very limited use and usability. There is no comment or help section in the code. It is not working, because the function "shift" is unknown.
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