areaGain(u, X, r, W=NULL, ngrid=spatstat.options("ngrid.disc"))
"ppp"
)."ppp"
)."owin"
)
in which the area should be computed.ngrid * ngrid
array of test points
that will be used to estimate the uncovered area.u
and one column for each value in r
.r
centred at the location u
that is not covered by any of the discs of radius r
centred at the points of the pattern X
.
This area is important in some calculations related to
the area-interaction model AreaInter
. If u
is a point pattern and r
is a vector,
the result is a matrix, with one row for each point in u
and one column for each entry of r
. The [i,j]
entry
in the matrix is the area of that part of the disc of radius
r[j]
centred at the location u[i]
that is
not covered by any of the discs of radius r[j]
centred at the points of the pattern X
.
If W
is not NULL
, then the areas are computed only
inside the window W
. Currently this is implemented only for
rectangular windows.
The area is calculated by discrete approximation, using an
ngrid * ngrid
grid of test points.
AreaInter
,
areaLoss
data(cells)
u <- c(0.5,0.5)
areaGain(u, cells, 0.1)
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