areaLoss
From spatstat v1.37-0
by Adrian Baddeley
Difference of Disc Areas
Computes the area of that part of a disc that is not covered by other discs.
Usage
areaLoss(X, r, ..., W=as.owin(X), subset=NULL,
exact=FALSE,
ngrid=spatstat.options("ngrid.disc"))
Arguments
- X
- Locations of the centres of discs.
A point pattern (object of class
"ppp"
). - r
- Disc radius, or vector of disc radii.
- ...
- Ignored.
- W
- Optional. Window (object of class
"owin"
) inside which the area should be calculated. - subset
- Optional. Index identifying a subset of the points of
X
for which the area difference should be computed. - exact
- Choice of algorithm.
If
exact=TRUE
, areas are computed exactly using analytic geometry. Ifexact=FALSE
then a faster algorithm is used to compute a discrete approximation to the areas. - ngrid
- Integer. Number of points in the square grid used to compute
the discrete approximation, when
exact=FALSE
.
Details
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
.
Value
- A matrix with one row for each point in
X
(orX[subset]
) and one column for each value inr
.
See Also
Examples
data(cells)
areaLoss(cells, 0.1)
Community examples
Looks like there are no examples yet.