spatstat.geom (version 3.1-0)

bounding.box.xy: Convex Hull of Points

Description

Computes the smallest rectangle containing a set of points.

Usage

bounding.box.xy(x, y=NULL)

Value

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

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.

Author

Adrian Baddeley

and Rolf Turner

Details

Given an observed pattern of points with coordinates given by x and y, this function finds the smallest rectangle, with sides parallel to the coordinate axes, that contains all the points, and returns it as a window.

See Also

owin, as.owin, convexhull.xy, ripras

Examples

  x <- runif(30)
  y <- runif(30)
  w <- bounding.box.xy(x,y)
  plot(owin(), main="bounding.box.xy(x,y)")
  plot(w, add=TRUE)
  points(x,y)

  X <- runifrect(30)
  plot(X, main="bounding.box.xy(X)")
  plot(bounding.box.xy(X), add=TRUE)