Description Usage Arguments Value Author(s)

give a set of location L, it calculate the travelling distance, i.e. sum of all the distance from L(i) to L(i-1).

1 | ```
GCD_pairs(x_lon, x_lat, y_lon, y_lat)
``` |

`x_lon` |
lon |

`x_lat` |
lat |

`y_lon` |
lon |

`y_lat` |
lat |

double

Yi Tang

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