scipy.spatial.cKDTree.query

cKDTree.query(self, x, k=1, eps=0, p=2, distance_upper_bound=np.inf)

Query the kd-tree for nearest neighbors.

Parameters :

x : array_like, last dimension self.m

An array of points to query.

k : int

The number of nearest neighbors to return.

eps : non-negative float

Return approximate nearest neighbors; the k-th returned value is guaranteed to be no further than (1 + eps) times the distance to the real k-th nearest neighbor.

p : float, 1 <= p <= infinity

Which Minkowski p-norm to use. 1 is the sum-of-absolute-values “Manhattan” distance. 2 is the usual Euclidean distance. infinity is the maximum-coordinate-difference distance.

distance_upper_bound : non-negative float

Return only neighbors within this distance. This is used to prune tree searches, so if you are doing a series of nearest-neighbor queries, it may help to supply the distance to the nearest neighbor of the most recent point.

Returns :

d : ndarray of floats

The distances to the nearest neighbors. If x has shape tuple+(self.m,), then d has shape tuple+(k,). Missing neighbors are indicated with infinite distances.

i : ndarray of ints

The locations of the neighbors in self.data. If x has shape tuple+(self.m,), then i has shape tuple+(k,). Missing neighbors are indicated with self.n.