Can't use functions like sin(s) with transfer function/nyquist

I'm trying to evaluate describing functions by plotting them with the nyquist command but it's not possible when a function like sin is a part of the describing function.

Any ideas?

Answer 1

[Navya Seelam]

Hi,

nyquist function is based on an algorithm which computes the zero-pole-gain representation of the system. sin(s) cannot be converted to zero-pole-gain representation and hence it cannot be used with nyquist.