未定义变量I写检查奈奎斯特准则的封闭系统的稳定性的算法(http://en.wikipedia.org/wiki/Nyquist_stability_criterion) function answear=stability(re,im)
%% Function check stability of system
%re is real part of transmitation
%im
clear all
syms s w
G = 1/((s)*(s+1)*(s+2)); %transfer function
G_w = subs(G,s,j*w);
W= [-100:0.01:100]; %[min_range:step size:max_range]
nyq = eval(subs(G_w,w,W));
x = real(nyq)
y = imag(nyq
有没有一种方法来确定nyquist图的稳定性,以检查它是稳定还是不稳定?我目前需要手动输入到另一个m.file传递函数来查看PZ位置,以确定 syms s w
G = (2*s+1)/((s^2)+(5*s)+6); %transfer function
G_w = subs(G,s,j*w);
W= [-100:0.1:100]; %[min_range:step