How do I use cdiff function in Matlab 2020?

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

Answer 1

[madhan ravi]

diff(y)