tile.list {deldir}R Documentation

Create a list of tiles in a tessellation.

Description

For each point in the set being tessellated produces a list entry describing the Dirichlet/Voronoi tile containing that point.

Usage

 tile.list(object) 

Arguments

object An object of class deldir as produced by the function deldir().

Value

A list with one entry for each of the points in the set being tesselated. Each entry is in turn a list with components

pt The coordinates of the point whose tile is being described.
x The x coordinates of the vertices of the tile, in anticlockwise order.
y The y coordinates of the vertices of the tile, in anticlockwise order.
bp Vector of logicals indicating whether the tile vertex is a ``real'' vertex, or a boundary point, i.e. a point where the tile edge intersects the boundary of the enclosing rectangle

Warning

The set of vertices of each tile may be ``incomplete''. Only vertices which lie within the enclosing rectangle, and ``boundary points'' are listed.

Note that the enclosing rectangle my be specified by the user in the call to deldir().

Author(s)

Rolf Turner

See Also

deldir(), plot.tile.list()

Examples

        x <- runif(20)
        y <- runif(20)
        z <- deldir(x,y)
        w <- tile.list(z)

        z <- deldir(x,y,rw=c(0,1,0,1))
        w <- tile.list(z)

        z <- deldir(x,y,rw=c(0,1,0,1),dpl=list(ndx=2,ndy=2))
        w <- tile.list(z)


[Package deldir version 0.0-4 Index]