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clc
clear
th=pi/10
for i=1:100
th=i*th
if mod(i,2)==0
r=1
else
r=0
end
polarplot(th,r)
hold on
end
matlab小白,想做一个极坐标的中心向四周线条发散的图,思路是使用for循环,偶数r为1,奇数r为0,类似下面这样的图,但我这个代码运行后图像里什么都没有,有大佬能帮忙看一看吗?。

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