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How to access the minor of a matrix.

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Hayashi
Hayashi 2013-6-5
If I have an n x n matrix, is there a way to access a smaller part of the matrix (thus yielding a smaller matrix) with arbitrary size? For instance, I have a randomly generated 32x32 matrix and I would like to access the 16x16 block in the lower right. I suppose I could simply access the entries I want but that seems inefficient, particularly as my matrix sizes increase.
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Jan
Jan 2013-6-5
What exactly seems inefficient?
Hayashi
Hayashi 2013-6-5
There isn't a difference. I can construct the minor by accessing the entries. I was wondering if I could simply specify the minor I want and MATLAB could create it.

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Iain
Iain 2013-6-5
big = randn(1000,1000,4);
small = big(n:n+m,o:o+p,q:q+r);
small is an m+1 x p+1 x r+1 matrix, which was taken starting at (n,o,q) of the big one...
It works on whatever number of dimensions you need.
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Matt J
Matt J 2013-6-5
编辑：Matt J 2013-6-5
@Hayashi
This doesn't seem different from "accessing the entries". The expression
small = big(n:n+m,o:o+p,q:q+r);
does access entries from "big".

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