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.
Remove NaN ?
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
Biggest Value in the (Neighbor)Hood
N-Dimensional Array Slice
Curve fitting (linear functions) & function handles
Anyone for tennis? Your chances of winning a (standard) game
Wait a second!
Arrange the names in alphabetical order (2)
Code breaker, Part II: Operation Orthos
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