如何用matlab绘制圆的内接正n边形及外接正n边形

Question

如题所述

Answer 1

r=1; %圆半径

n=6; %n边形,n>=3

%画圆

tt = (0:0.01:1)*2*pi;

x=r*sin(tt);

y=r*cos(tt);

plot(x,y);

axis equal

hold on;

%内接圆

theta = (0:1/n:1)*2*pi;

[x,y]=pol2cart(theta,r);

plot(x,y);

%外接圆

theta = pi/n*ones(1,n+1)+(0:1/n:1)*2*pi;

r1 = r/cos(2*pi/2/n)*ones(1,n+1);

[x,y]=pol2cart(theta,r1);

plot(x,y);