Replace elements of numpy.ndarray specified with ndarray

I have 2D numpy.ndarray() and indices to be replaced.

idx = np.array([[1, 0],
                [2, 1],
                [2, 3],])
array = np.array([[0, 0, 0, 0],
                  [0, 0, 0, 0],
                  [0, 0, 0, 0]])

Which I want to have is like following array.

np.array([[0, 0, 0, 0],
          [1, 0, 0, 0],
          [0, 1, 0, 1]])

Elements where specified by idx in the array is replaced with an arbitrary value.

>Solution :

If I understand you correctly you want to index the array by 2D array idx:

array[idx[:, 0], idx[:, 1]] = 1
print(array)

Prints:

[[0 0 0 0]
 [1 0 0 0]
 [0 1 0 1]]