how can plot the region of convergence?

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sara
sara 2016-4-3
评论： sara 2016-4-3
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（1 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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