12.3. Root Locus Plot Using MATLAB

A number of rules have to be followed for plotting the root locus by conventional method. However, it can be easily plotted by using predefined built-in functions in MATLAB. In general, the open-loop transfer function is given as

12.5.

where

n(s) is the numerator polynomial, and

d(s) is the denominator polynomial.

The characteristic equation of the closed-loop transfer function is given by

12.6.

To plot the root locus of the characteristic equation d(s) + Kn(s) = 0, rlocus command is used. The syntax ...

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