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.
Make a checkerboard matrix
Get the area codes from a list of phone numbers
Rotate a Matrix
The other half of the Fibonacci sequence
Curve fitting (linear functions) & function handles
Anyone for tennis? Your chances of winning a (standard) game
Rate of event occurence: find percentiles of the distribution (for smallish rates)
Back to basics: adding comments to your code
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