matlab里怎么知道xy的值求zy的曲线图

r = 2;
xi = 0.08;
F = 0.05;
omega = linspace(0,1.5,5000);
F = sqrt((3rd^3/4-domega^2)^2+(2xidomega)^2);
figure
plot(omega,d,'r-')
求解答该怎么操作

你这个方程会得到复数解