how can plot complex data in matlab?

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sara 2016-4-2

编辑： sara 2016-4-3

hi all how can I plot abs(z)<.5? I want to have an image like below. it is for abs(z)=2. thanks

Azzi Abdelmalek 2016-4-2

alpha=-pi:0.01:pi
k=.5
x=k*cos(alpha);
y=k*sin(alpha);
fill(x,y,'r')

sara 2016-4-3

编辑：sara 2016-4-3

thanks dear Azzi Abdelmalek. and Is there any way for abs(z)>.5.

for example if I want to got the ROC in below how can I plot this?

I mean that how can I get intersection of regions? can you guide me please?

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