How to get the values from some of the coordinates?

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 :')

Answer 1

[Jan]

Y = A(sub2ind(size(A), B(:,1), B(:,2)));

[Isti]

thank you :)

[Andrei Bobrov]

A(bsxfun(@minus,B,[0 1])*[1;size(A,1)])