### Navigation

- index
- modules |
- modules |
- SciPy v0.9 Reference Guide (DRAFT) »

# scipy.spatial.KDTree.query

`KDTree.``query`(x, k=1, eps=0, p=2, distance_upper_bound=inf)

  query the kd-tree for nearest neighbors

  Parameters : | x : array-like, last dimension self.m An array of points to query. k : integer The number of nearest neighbors to return. eps : nonnegative float 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. 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 : nonnegative 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 : 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 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). i : array of integers The locations of the neighbors in self.data. i is the same shape as d.

  Examples

      >>> from scipy.spatial import KDTree
      >>> x, y = np.mgrid[0:5, 2:8]
      >>> tree = KDTree(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]))

### Navigation

- index
- modules |
- modules |
- SciPy v0.9 Reference Guide (DRAFT) »