getMaxPairDist {shotGroups} | R Documentation |
Maximum pairwise distance for a set of points
Description
Calculates the maximum of pairwise distances between points given a set of coordinates.
Usage
getMaxPairDist(xy)
## S3 method for class 'data.frame'
getMaxPairDist(xy)
## Default S3 method:
getMaxPairDist(xy)
Arguments
xy |
either a numerical (n x p)-matrix with the coordinates of n points in p-dimensional space (1 row of coordinates per point), or a data frame with either the variables |
Value
A list with the following components
d |
numerical value with the maximum pairwise distance between points. |
idx |
a vector with two entries giving the row indices of the points that are farthest apart. |
Examples
# coordinates given by a suitable data frame
(maxPD <- getMaxPairDist(DFsavage))
# plot points and point pair with maximum distance
plot(point.y ~ point.x, data=DFsavage, asp=1, pch=16)
x0 <- DFsavage$point.x[maxPD$idx[1]] # 1st point x
y0 <- DFsavage$point.y[maxPD$idx[1]] # 1st point y
x1 <- DFsavage$point.x[maxPD$idx[2]] # 2nd point x
y1 <- DFsavage$point.y[maxPD$idx[2]] # 2nd point y
segments(x0, y0, x1, y1, col="green3", lwd=2)
# coordinates given by a matrix
## Not run:
xy <- matrix(round(rnorm(20, 100, 15), 1), ncol=2)
getMaxPairDist(xy)
## End(Not run)
[Package shotGroups version 0.8.2 Index]