Plotting Root Locus In matlab with K being a positive integar

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I have a transfer function of K/(s^3+9s^2+27s+27) and am wondering how to plot the root locus of this as the numerator is a variable. K is gain and has to be a positive integar.

Answers (1)

Paul
Paul on 3 May 2022
Can use
r = rlocus(sys,K)
where sys is the transfer function with numerator of 1 and K is a vector of positive integers of interest. Then use plot() to plot the imaginary part and real part of r.

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