Matrix Indexig or how to access values of a matrix

Hallo dear forum,

I just don't find a problem for my actually simple problem.

I have the following matrix:

A = magic(4)

I now want the values ​​of the matrix in position:

value1 = A(1,1)
value2 = A(2,2)
value3 = A(3,1)

My actual matrix indexes are in a vector in this form:

index = [1 1;2 2;3 1];

My solution (that is obviously wrong) would be:

solution = A(index)

Is there an easy way without using loops?

Thank you so much!

Answer 1

[Tommy]

You could convert to linear indices:

solution = A(sub2ind(size(A),index(:,1),index(:,2)));

[Philipp ter Schiphorst]

Thank you very much, that was exactly what I was looking for