scipy.spatial.KDTree.query¶

KDTree.
query
(x, k=1, eps=0, p=2, distance_upper_bound=inf)[source]¶ Query the kdtree for nearest neighbors
 Parameters
 xarray_like, last dimension self.m
An array of points to query.
 kint, optional
The number of nearest neighbors to return.
 epsnonnegative float, optional
Return approximate nearest neighbors; the kth returned value is guaranteed to be no further than (1+eps) times the distance to the real kth nearest neighbor.
 pfloat, 1<=p<=infinity, optional
Which Minkowski pnorm to use. 1 is the sumofabsolutevalues “Manhattan” distance 2 is the usual Euclidean distance infinity is the maximumcoordinatedifference distance
 distance_upper_boundnonnegative float, optional
Return only neighbors within this distance. This is used to prune tree searches, so if you are doing a series of nearestneighbor queries, it may help to supply the distance to the nearest neighbor of the most recent point.
 Returns
 dfloat or array of floats
The distances to the nearest neighbors. If x has shape tuple+(self.m,), then d has shape tuple if k is one, or tuple+(k,) if k is larger than one. Missing neighbors (e.g. when k > n or distance_upper_bound is given) are indicated with infinite distances. If k is None, then d is an object array of shape tuple, containing lists of distances. In either case the hits are sorted by distance (nearest first).
 iinteger or array of integers
The locations of the neighbors in self.data. i is the same shape as d.
Examples
>>> from scipy import spatial >>> x, y = np.mgrid[0:5, 2:8] >>> tree = spatial.KDTree(list(zip(x.ravel(), y.ravel()))) >>> tree.data array([[0, 2], [0, 3], [0, 4], [0, 5], [0, 6], [0, 7], [1, 2], [1, 3], [1, 4], [1, 5], [1, 6], [1, 7], [2, 2], [2, 3], [2, 4], [2, 5], [2, 6], [2, 7], [3, 2], [3, 3], [3, 4], [3, 5], [3, 6], [3, 7], [4, 2], [4, 3], [4, 4], [4, 5], [4, 6], [4, 7]]) >>> pts = np.array([[0, 0], [2.1, 2.9]]) >>> tree.query(pts) (array([ 2. , 0.14142136]), array([ 0, 13])) >>> tree.query(pts[0]) (2.0, 0)