clear
t=0:0.01:2*pi;
z=0.38961*((cos(t)+sin(t)*i)-0.131134/(cos(t)+sin(t)*i)-（0.06094*i）/（(cos(t)+sin(t)*i)^2）-0.10324/（(cos(t)+sin(t)*i)^3）+（0.0425*i）/（(cos(t)+sin(t)*i)^4)）;
r=abs(z);
bdelta=angle(z);
subplot(2,1,1)
plot(z)
title(*直角坐标图*);
subplot(2,1,2)
polar(delta,r)
title(*极坐标图*)
显示的是第二步Error: Missing variable or function.