extract sub matrix of sub matrix directly

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Abhijit Das
Abhijit Das 2012-3-20
I have matrix a m-by-n-by-p.
b=a(:,:,1) is a sub matrix of a.
I want to extract sub matrix of b (say c) so that
c=b(1:4, 1:4)
Can I extract c from matrix a such as
c=[a(:,:,1)](1:4, 1:4) This means
c=b(1:4, 1:4)
With regards -Abhijit

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采纳的回答

Wayne King
Wayne King 2012-3-20
Yes,
C = a(1:4,1:4,1);

更多回答（1 个）

Dr. Seis
Dr. Seis 2012-3-20
You will have to use reshape if you take a sub-set a different way, e.g.:
>> a = rand(3,3,3);
>> b = a(1:2,1:2,1)
b =
0.3922 0.7060
0.6555 0.0318
>> b = a(1:2,1,1:2)
b(:,:,1) =
0.3922
0.6555
b(:,:,2) =
0.6948
0.3171
>> b = reshape(a(1:2,1,1:2),[2,2])
b =
0.3922 0.6948
0.6555 0.3171

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