Check For Empty Tiles in a Tessellation
Checks whether each tile in a tessellation is empty or non-empty.
tiles.empty(x)
x |
A tessellation (object of class |
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).
A logical vector.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
Rolf Turner r.turner@auckland.ac.nz
and Ege Rubak rubak@math.aau.dk
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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.