Is there any built-in function to make a matrix having non-zero entries in reverse diagonal only?

I know the command eye(3) generates an identity matrix having ones in its principal diagonal but I want to make a matrix that has ones in its secondary diagonal. I have searched out but the diag() command also places the entries in principal diagonal or in other diagonals moving from left to right however, I want to place the entries from right to left.

a = eye(3)
b = diag(2,3,4)

The outputs of above commands are given as

a = 
     1     0     0
     0     1     0
     0     0     1
b =
     2     0     0
     0     3     0
     0     0     4

However I want a matrix like this one

     0     0     1
     0     1     0
     1     0     0

Answer 1

[madhan ravi]

flip(a)