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.
Better bullseye matrix
Angle between two vectors
System of equations
Steal, Share, or Catch
What score did they give?
Code breaker, Part II: Operation Orthos
Comparison of floating-point numbers (doubles)
Is input the global variable z?
Back to basics: adding comments to your code
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