The function you are trying to use here is part of the Signal Processing Toolbox, which is not available on Cody. However, you might find another way of implementing your idea in core MATLAB without that specific function.
Great Circle Distance
Wind outward from the center ...
Back to basics: adding comments to your code
Code breaker, Part I: Operation Phoenix
Comparison of floating-point numbers (doubles)
Make your own Test Suite (part 2)
Testing for randomness: uniform distribution of real numbers (distribution checking)
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