How do I use cdiff function in Matlab 2020?

2020 8 22
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更新时间：2020 8 22
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I have a function to calculate velocity:
>> x = [0:0.05:20];
>> y = cos(t);
>> velocity = cdiff(y,0.05);
I get the following error:
Unrecognized function or variable 'cdiff'
I am using MATLAB 2020.
I wanted to find the derivative of the function, but it says cdiff is not a function. I was wondering if I need to import a module for cdiff to work

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