Calculates a geographic distance matrix based on a
a two column
matrix of x(longitude) and y(latitude).
Arguments to be passed to the function
This function basically facilitates the use of
PresenceAbsence object, allowing also the user to have directly
The user can choose between
matrix class object to be returned.
The resulting values are in kilometers (but see the argument 'miles' in
Bruno Vilela & Fabricio Villalobos
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