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.
Which doors are open?
Create a function handle that reverses the input arguments of another function handle
Find S-parameters of the circuit
Is this matrix orthogonal?
The twelve days of Christmas
Make your own Test Suite (part 2)
Anyone for tennis? Your chances of winning a tie-break game
Comparison of floating-point numbers (singles)
Anyone for tennis? Your chances of winning a (standard) game
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