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How we can enter the following operators in MATLAB ?

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Ahmed Grera
Ahmed Grera 2018-4-27
回答： Walter Roberson 2018-4-27
1- x(n)=δ(n)
2- δ(n-4)
3- 2^n u(n-3)

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Walter Roberson
Walter Roberson 2018-4-27
For delta, see:
https://www.mathworks.com/help/symbolic/dirac.html
https://www.mathworks.com/help/symbolic/kroneckerdelta.html
For u:
https://www.mathworks.com/help/symbolic/heaviside.html
However, when people write in terms of u, they often mean the unit step function. To achieve the unit step function you need to use sympref to set the value of HeavisideAtOrigin according to your needs.

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