Nearest neighbours for two point patterns
Calculate nearest neighbours for two point patterns
n2dist(pts1,pts2)
pts1,pts2 |
Point data sets |
Returns a list with components $dists and $neighs.
$dists[i] is the distance
of the nearest neighbour of point pts2[i,]
in pts1 and $neighs[i]
is the index in pts1 of the point nearest to pts2[i,]. Documentation and example by Alun Pope, 2007-08-23.
Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19, 627-655; the original sources can be accessed at: https://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307-317.
(test1 <- matrix(c(151.1791, -33.86056, 151.1599, -33.88729, 151.1528, -33.90685, 151.1811, -33.85937),nrow=4,byrow=TRUE)) (test2 <- as.points(151.15, -33.9)) n2dist(test1,test2) n2dist(test2,test1)
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