# convexhull.xy

0th

Percentile

##### Convex Hull of Points

Computes the convex hull of a set of points in two dimensions.

Keywords
utilities, spatial
##### Usage
convexhull.xy(x, y=NULL)
##### Arguments
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.
##### Details

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.

##### Value

• A window (an object of class "owin").

##### See Also

owin, as.owin, convexhull, bounding.box.xy, ripras

##### Aliases
• convexhull.xy
##### Examples
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)
Documentation reproduced from package spatstat, version 1.36-0, License: GPL (>= 2)

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