Checks whether each tile in a tessellation is empty or non-empty.
tiles.empty(x)A logical vector.
A tessellation (object of class "tess").
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
Rolf Turner rolfturner@posteo.net
and Ege Rubak rubak@math.aau.dk
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).
tess,
tiles,
tilenames,
tile.areas
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)
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