how to know pixel' s value of matrix

hello i have a matrix (a)

a= [a b c d;
 e f g h;
 i j k l]

• i wanna test/know the values of d,h,l and i j k l

Answer 1

[the cyclist]

For the last column

a(:,end)

OR

a(:,4)

For the last row:

a(end,:)

OR

a(3,:)