The direction vectors for neighbour pixels

The 3 below neighbours of a pixel x(i,j) are x(i+1,j-1), x(i+1,j) and x(i+1,j+1). These neighbours can be accessed by (-1/sqrt(2), -1/sqrt(2)) ,(0,1) and (1/sqrt(2),-1/sqrt(2)) .

Can u tell me how to find the direction vectors corresponding to the 3 right side neighbours for a pixel x(i,j). The 3 neighbours are x(i-1,j+1), x(i,j+1) and x(i+1,j+1).

[David Young]

Note that as you already have the answer for x(i+1, j+1), you only need to find out the other two.

Can you explain why you can't do the right neighbours when you can do the bottom ones? If it's homework, perhaps you like to make an attempt at your own answer and then ask if you are correct.