I need help with coding this for matlab please.  Plotting Discrete-TimeSignals  Use stem to plot the discrete-time step-function:  n = -10:10;   f = n >= 0;  stem(n,f)  Make stem plots of the following signals. Decide for yourself what the range of n should be. f(n) = u(n) − u(n − 4)  g(n) = n · u(n) − 2 (n − 4) · u(n − 4) + (n − 8) · u(n − 8)  x(n) = δ(n) − 2 δ(n − 4)  y(n) = (0.9)n (u(n) − u(n − 20))  v(n) = cos(0.12 πn) u(n)

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