replace one matrix with the positon indicated in another matrix

I have two large matrices, for instance

A = [1 3 3 4];

B = [1 2 3 4 ; 5 6 7 8 ; 9 10 11 12 ; 13 14 15 16 ] ;

matrix A represents the postion of numbers of matrix B.

Now how to write B as:

B = [1 3 3 4 ; 5 7 7 8 ; 9 11 11 12; 13 15 15 16];

Answer 1

[Bruno Luong]

B(:,A)

Answer 2

[KSSV]

A = [1 3  3 4];
B = [1 2 3 4 ; 5 6 7 8 ; 9 10 11 12 ; 13 14 15 16 ] ;
B(:,2) = B(:,2)+1 ;

[tanveer haq]

Thank you for the help KSSV and Bruno Luong.