spatstat.geom (version 3.3-2)

tiles.empty: Check For Empty Tiles in a Tessellation

Description

Checks whether each tile in a tessellation is empty or non-empty.

Usage

tiles.empty(x)

Value

A logical vector.

Arguments

x

A tessellation (object of class "tess").

Author

Adrian Baddeley

Rolf Turner

and Ege Rubak

Details

A tessellation is a collection of disjoint spatial regions (called tiles) that fit together to form a larger spatial region. See tess.

It is possible for some tiles of a tessellation to be empty. For example, this can happen when the tessellation x is obtained by restricting another tessellation y to a smaller spatial domain w.

The function tiles.empty checks whether each tile is empty or non-empty. The result is a logical vector, with entries equal to TRUE when the corresponding tile is empty. Results are given in the same order as the tiles would be listed by tiles(x).

See Also

tess, tiles, tilenames, tile.areas

Examples

  A <- tess(xgrid=0:2,ygrid=0:2)
  tiles.empty(A)
  v <- as.im(function(x,y){factor(round(x^2 + y^2))}, W=owin())
  E <- tess(image=v)
  tiles.empty(E)