Computes the area of that part of a disc that is not covered by other discs.
areaLoss(X, r, ..., W=as.owin(X), subset=NULL,
exact=FALSE,
ngrid=spatstat.options("ngrid.disc"))
A matrix with one row for each point in X
(or X[subset]
)
and one column for each value in r
.
Locations of the centres of discs.
A point pattern (object of class "ppp"
).
Disc radius, or vector of disc radii.
Ignored.
Optional. Window (object of class "owin"
)
inside which the area should be calculated.
Optional. Index identifying a subset of the points of X
for which the area difference should be computed.
Choice of algorithm.
If exact=TRUE
, areas are computed exactly using
analytic geometry. If exact=FALSE
then a faster algorithm
is used to compute a discrete approximation to the areas.
Integer. Number of points in the square grid used to compute
the discrete approximation, when exact=FALSE
.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au and Rolf Turner rolfturner@posteo.net
This function computes, for each point X[i]
in X
and for each radius r
,
the area of that part of the disc of radius r
centred at the
location X[i]
that is not covered by any of the
other discs of radius r
centred at the points X[j]
for j
not equal to i
.
This area is important in some calculations related to
the area-interaction model AreaInter
.
The result is a matrix, with one row for each point in X
and one column for each entry of r
.
AreaInter
,
areaGain
,
dilated.areas