How would one proceed to plot this?
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Dana on 22 Sep 2020
What is u supposed to be? Some kind of vector you've previously defined? If so, and assuming u is a column vector whose j-th element corresponds to n=j-3 (e.g., the first element of u corresponds to n=1-3=-2, etc.):
nvc = (-2:100).';
y = 3/40*(-3/4).^n.*u + 1/20*(1/2).^n.*u;