#! /usr/bin/env python

import openturns as ot

ot.TESTPREAMBLE()

regularGrid = ot.RegularGrid(-1.0, 0.1, 21)
regularGridNearestNeighbourAlgorithm = ot.RegularGridNearestNeighbour(regularGrid)
print("regularGridNearestNeighbourAlgorithm=", regularGridNearestNeighbourAlgorithm)

test = ot.Normal().getSample(20)
for i in range(len(test)):
    index = regularGridNearestNeighbourAlgorithm.query(test[i])
    neighbour = ot.Point(
        1, regularGrid.getValue(regularGridNearestNeighbourAlgorithm.query(test[i]))
    )
    print("Nearest neighbour of", test[i], "=", neighbour, "index=", index)

k = 4
for i in range(len(test)):
    indices = regularGridNearestNeighbourAlgorithm.queryK(test[i], k, True)
    print(k, "nearest neighbours of", test[i], "(indices=", indices)