numpy.argwhere()

Find the indices of array elements that are non-zero, grouped by element.

Notes

np.argwhere(a) is the same as np.transpose(np.nonzero(a)).

The output of argwhere is not suitable for indexing arrays. For this purpose use where(a) instead.

Examples

>>> x = np.arange(6).reshape(2,3)
>>> x
array([[0, 1, 2],
       [3, 4, 5]])
>>> np.argwhere(x>1)
array([[0, 2],
       [1, 0],
       [1, 1],
       [1, 2]])