K nearest neighbours

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`query` |
Matrix or data frame containing the set of query points where each row represents a point. |

`ref` |
Matrix or data frame containing the set of reference points where each row represents a point. |

`k` |
Number of nearest neighbours to search for. |

`build` |
String indicating the search structure to be used: "kdtree", "kmeans", "linear" |

.

`cores` |
Number of cpu cores to be used for searching. If 0, then the maximum allowable cores are used. |

`checks` |
Number of checks during searching. Higher value gives better search precision but takes longer. See FLANN C++ manual for more details. |

List containing:

`indices` |
Matrix containing the index of the nearest neighbours in the reference set for each query set of points |

`distances` |
Matrix containing the distances to the nearest neighbours |

Yee, Jeremy

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