Indexing one array by another in numpy

Question

Suppose I have a matrix A with some arbitrary values:

array([[ 2, 4, 5, 3],
       [ 1, 6, 8, 9],
       [ 8, 7, 0, 2]])

A

Answer 1

I know this is an old question, but another way of doing it using indices is:

A[np.indices(B.shape)[0], B]

output:

[[2 2 4 5]
 [1 9 8 6]
 [2 0 7 8]]