Index a 2D Numpy array with 2 lists of indices

Question

I\'ve got a strange situation.

I have a 2D Numpy array, x:

x = np.random.random_integers(0,5,(20,8))

And I have 2 indexers--one w

Answer 1

What about:

x[row_indices][:,col_indices]

For example,

x = np.random.random_integers(0,5,(5,5))
## array([[4, 3, 2, 5, 0],
##        [0, 3, 1, 4, 2],
##        [4, 2, 0, 0, 3],
##        [4, 5, 5, 5, 0],
##        [1, 1, 5, 0, 2]])

row_indices = [4,2]
col_indices = [1,2]
x[row_indices][:,col_indices]
## array([[1, 5],
##        [2, 0]])