I am having some trouble to understand how the RootLocusPlot works (options, drawing and etc.) Here is an example ...
I have a transfer function: Gs = TransferFunctionModel[10/((s + 1) (s - 1) (s + 9)), s] I made a Nyquist plot and it looks like what I expect. Gain margin ...
In order to see some details on a Nyquist Diagram I have used the function NyquistPlot that comes with Mathematica v8 and v9. ...