Cannot compute the root locus of models with complex data

Hi everyone,

I'm trying to use the function "rlocusplot(H)" with a comlex transfer function: H = 1/(s + 1 + 1i), without success.

Could someone please help me. Many thanks!

Best regards

Tony

Answer 1

[Paul]

Well, you can always loop through values of K and for each value of K solve for s that satisfies

den(s) + K*num(s) = 0

and plot the resulting values of s.

For simple, or even moderately complex, problems, the function roots would be helpful.

If you don't mind me asking, what kind of problem results in a trasnfer function with complex coefficients?

[Tony]

Hi Paul, thanks for answer!

So you mean, there isn't a function like rlocus(H1) from matlab for transfer function with complex coefficients ?

[Paul]

Not that I'm aware of. But you can search the doc.