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In polar Plot:
just convert your equation to polar form before any programming
x=0i/100:2*pi;
r=abs(exp(-i*x));
the=angle(exp(-i*x));
polar(the,r)
now if you want to plot it directly, the imaginary part will be ignored as below
x=0i/100:2*pi;
y=exp(-i*x);
plot(x,y)
Warning: Imaginary parts of complex X and/or Y arguments ignored
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