A $d$ x 2 matrix containing the
Cartesian coordinates of $d$ points in the plane.
maxDistance
Pairs of locations with distance not
larger than maxDistance will be selected. If
NULL, then the selection is made based on
numberOfPairs.
numberOfPairs
The number of pairs that will be
selected, taking distance as a criterion, with closer
pairs being selected. It will return more pairs if there
are several equidistant locations.
Value
A matrix with q rows and 2 columns, where q
denotes the number of pairs selected. Each row contains the
indices of the corresponding pair of selected locations in
the input argument locations.