unique-rows

unique_rows

skimage.util.unique_rows(ar) [source]

Remove repeated rows from a 2D array.

In particular, if given an array of coordinates of shape (Npoints, Ndim), it will remove repeated points.

Parameters:	ar : 2-D ndarray The input array.
Returns:	ar_out : 2-D ndarray A copy of the input array with repeated rows removed.
Raises:	ValueError : if ar is not two-dimensional.

Notes

The function will generate a copy of ar if it is not C-contiguous, which will negatively affect performance for large input arrays.

Examples

>>> ar = np.array([[1, 0, 1],
...                [0, 1, 0],
...                [1, 0, 1]], np.uint8)
>>> unique_rows(ar)
array([[0, 1, 0],
       [1, 0, 1]], dtype=uint8)