An error is reported when plotting the Nyquist curve with matlab. Please help me to see the problem and how to modify it?

The code show as below:

clc;clear;
syms s;
H1=[1/s,2/s;3/s,4/s];
[V,D]=eig(H1);
D
nyquist(D);

The error message is as follows:

Error using nyquist (line 73)
Not enough input arguments.

Error in Untitled4 (line 6)
nyquist(D);

Answer 1

[Nishant Gupta]

Refer to the documentation of nyquist function, you will find that the input argument to the function should be a system transfer function and you are passing the eigen value matrix, that's why you are getting the error.

Create transfer function of the system and then give it to nyquist function to get the plot.