[R] Distances between two datasets of x and y co-ordinates

Tom_R tom.richardson at bristol.ac.uk
Thu Mar 18 00:25:01 CET 2010

How do I  use nncross to measure min distances between point patterns i,j,
ENSURING each point in pattern i is only connected to a single partner 
point  in pattern j ?
I do realise that there are many possible pairings between the i-j point
pairs... perhaps some average min distance for many pairings would be
better.   Alternatively pairings could be randomly assigned. 

Basically, i am tracking a population of moving objects over time, and want
to indirectly estimate the collective movement- which might be better
estimated by telling nncross to randomly assign (somehow) paired nearest
neighbour distances ; 1-to-1 rather than  many-to-one.

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