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How to get the values from some of the coordinates?

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Isti
Isti on 30 Apr 2012
I have matrix A like this:
A =
2 1 4 5 2
3 4 5 1 2
5 3 5 4 3
3 2 1 9 3
7 1 8 2 4
Then I have a matrix that decribe list of the coordinates is like this:
B =
1 2
3 4
4 1
So, the coordinate we can take from matrix B above is (1,2), (3,4), (4,1).
Then I want to produce the vector Y that consist of the value of matrix A which located is took from matrix B.
So the vector Y that will be produced is like this:
Y =
1
4
3
What to do?
Thanks before :')

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Accepted Answer

Jan
Jan on 30 Apr 2012
Y = A(sub2ind(size(A), B(:,1), B(:,2)));

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