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.
Back and Forth Rows
Determine if input is odd
Sort a list of complex numbers based on far they are from the origin.
Sum the Infinite Series
Solve the set of simultaneous linear equations
Make your own Test Suite (part 1)
Monte Carlo integration: area of a polygon
Add all the numbers between two limits (inclusive)
Guess the number I'm thinking of
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