| convexhull.xy {spatstat} | R Documentation |
Computes the convex hull of a set of points in two dimensions.
convexhull.xy(x, y=NULL)
x |
vector of x coordinates of observed points,
or a 2-column matrix giving x,y coordinates,
or a list with components x,y giving coordinates
(such as a point pattern object of class "ppp".)
|
y |
(optional) vector of y coordinates of observed points,
if x is a vector. |
Given an observed pattern of points with coordinates
given by x and y, this function computes
the convex hull of the points, and returns it as a window.
A window (an object of class "owin").
Adrian Baddeley adrian@maths.uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner rolf@math.unb.ca http://www.math.unb.ca/~rolf
owin,
as.owin,
bounding.box.xy,
ripras
x <- runif(30) y <- runif(30) w <- convexhull.xy(x,y) plot(owin(), main="convexhull.xy(x,y)", lty=2) plot(w, add=TRUE) points(x,y) X <- rpoispp(30) plot(X, main="convexhull.xy(X)") plot(convexhull.xy(X), add=TRUE)