function?first
w2=10;
figure
t=0:0.01:20*pi/10;
n=1.1;
e=100;
for?r=70
????for?theta=[0?pi/10]
????????x=vectorize（‘r*cos（theta-n*w2*t+w2*t）+e*cos（w2*t）‘）;
????????y=vectorize（‘r*sin（theta-n*w2*t+w2*t）+e*sin（w2*t）‘）;
????????x=eval（x）;
????????y=eval（y）;
????????plot（xy‘k‘‘linewidth‘1）;
????????hold?on
????end?
end
a=0:0.01:2*pi;
plot（50*cos（a）50*sin（a）‘k‘‘linewidth‘3）;
axis（[-250250-250250]）
set（gca‘LineWidth‘2）
set（gca‘FontSize‘14）
axis?tight
axis?equal
hold?off

????
????????tle>未將對象引用設(shè)置到對象的實例。tle>
????????ta?name=“viewport“?content=“width=device-width“?/>
????????yle>
?????????body?{font-family:“Verdana“;font-weight:normal;font-size:?.7em;color:black;}?
?????????p?{font-family:“Verdana“;font-weight:nor