how can i extract circular data from matrix?

W K
2018 8 21
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更新时间：2018 8 22
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Hi,
I have axb double data, and I want to extract circular nxn data.
For example, as you can see in the jpg file I attached,
If there is data A (9x9 double),
I assign center as A(5,5) (orange), and diameter r=3,
then I want to extract 7x7 double data from A that I mark as green.
Thanks to all!

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