Finding values corresponding to row and column index of a matrix

I have a matrix 'A'. I would like to find the elements in 'A', corresponding to the indices given in 'row_index' and 'col_index'.

The required output is shown as; 'out'

A = [1 12 23 19 1  13;
2 3  13 34 5  75;
5 22 45 5  1  94;
4 5  68 2  5  17;
2 4  34 11 13 92];
row_index = [4,5,5];
col_index = [3,4,5];
out  = [68,11,13]; 

Answer 1

[Thiago Henrique Gomes Lobato]

Have a look at the sub2ind function:

A = [1 12 23 19 1  13;
2 3  13 34 5  75;
5 22 45 5  1  94;
4 5  68 2  5  17;
2 4  34 11 13 92];
row_index = [4,5,5];
col_index = [3,4,5];
ind = sub2ind(size(A),row_index,col_index);
A(ind)
ans =

    68    11    13