How to extract matrix elements using index pairs?

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Wendy Song
Wendy Song 2018-4-5
评论： Wendy Song 2018-4-5
Might be a really basic question: Suppose I have a matrix:
>> A = magic(3)
A =
8 1 6
3 5 7
4 9 2
I want to extract the elements A(1,1) and A(2,2). Is there a command to call the elements all at once by specifying a list of index pairs? Something like:
A((1,1);(2,2))
so that the output would be
ans =
8
5
I tried
A([1;2],[1;2])
A([1 1; 2 2])
but they both returned a matrix instead of a vector.

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采纳的回答

Birdman
Birdman 2018-4-5
r=[1 2];
c=[1 2];
A(sub2ind(size(A),r,c))

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