I need to find difference equation and frequency response
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a) Find the difference equation
b) Plot the frequency response
Please see this previous discussion
However, it appears to me that your equation probably cannot be analyzed through these techniques, as it is not in the form of a ratio of polynomials. The z^z term is going to lead you to a lot of problems.
Difference equation (I assume that z^z-1 should be z^-1):
A=[1 2 3];
[H,W] = freqz(B,A);
My speculation was that the z^z-1 should be z^2 - 1 but that doesn't make sense with the leading -3 . So I still don't know what was intended.
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