%% polar(theta,r)极坐标绘图
x = 0:pi/100:pi;
y = sin(x);
subplot(231);
polar(x,y);
title(‘the sine function plotted in polar coordinates is a circle.’);
hold

%%
theta = 0:pi/100:2pi;
r = 5
cos(4theta);
r1 = 4
cos(6theta);
subplot(232);
polar(theta,r);
subplot(233);
polar(theta,r1);
r3 = 5 - 5
sin(theta);
r4 = sqrt(5^2cos(2theta));
subplot(234);
polar(theta,r3);
subplot(235);
polar(theta,r4);

theta1 = pi/2:4/5pi:4.8pi;
r = [1 1 1 1 1 1];
subplot(236);
polar(theta1,r);
matlab polar画图

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