how can plot the region of convergence?

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sara
sara 2016-4-3
回答： Paul 2024-12-24
hi all can you guide me how can plot the region of convergence? for example for below image?
thanks

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回答（2 个）

Image Analyst
Image Analyst 2016-4-3
See the FAQ for how to create and plot circles http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F
You can also use fill() or patch() to fill it with color, so you might plot a filled gray one, and then put "hold on" and place a smaller white one on top of it.
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Image Analyst
Image Analyst 2016-4-3
Try calling rectangle again with a smaller radius, so you'd have two of them.
sara
sara 2016-4-3
thanks. this work true :)
Is there any way to fill out of the circle? like below?

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Paul
Paul 2024-12-24
Ran in:
Since 2024a, radiusregion looks like a reasonable approach to get started.
For example, suppose the region of convergence is 0.5 < abs(z) < 1.5
h = polaraxes;
r = radiusregion(h,0.5,1.5);
h.RLim = [0 2];
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