准备开学上复变函数，图1.9. 图后有 MATLAB源代码，绘制箭头需下载 arrow3.m

clear,clc,close all

z = 1 + i;

r = 2^(1/8);

t = 0:0.05:6.3; plot(r*cos(t),r*sin(t),'k');hold on% 画圆

text(1,1,['$$',strcat(num2str(1),' + i'),'$$'],'interpreter','latex','fontsize',14);

for k = 0:3

   w(k+1) = r*exp(i*((pi/4+2*k*pi)/4));

   text(real(w(k+1)),imag(w(k+1)),['$$',strcat('w_',num2str(k)),'$$'],...

       'interpreter','latex','fontsize',14);

end

x = real(w); y = imag(w); vx = [1,x]'; vy = [1,y]';

arrow3(zeros(5,2),[vx,vy],'1o',0.08,[],[],[],0.5)% 画向量

% 画圆内接正方形

x = [x,x(1)]; y = [y,y(1)]; plot(x,y);

axis equal;grid on