## S3 method for class 'ppp':
duplicated(x, \dots, rule=c("spatstat", "deldir", "unmark")) ## S3 method for class 'ppx':
duplicated(x, \dots)
"ppp"
or "ppx"
).x
.duplicated
for
point pattern datasets (of class "ppp"
, see
ppp.object
, or class "ppx"
).Two points in a point pattern are deemed to be identical if their $x,y$ coordinates are the same, and their marks are also the same (if they carry marks). The Examples section illustrates how it is possible for a point pattern to contain a pair of identical points.
This function determines which points in x
duplicate
other points that appeared earlier in the sequence. It
returns a logical vector with entries that are TRUE
for duplicated points and FALSE
for unique (non-duplicated)
points.
If rule="spatstat"
(the default), two points are deemed
identical if their coordinates are equal according to ==
,
and their marks are equal according to ==
.
This is the most stringent possible test.
If rule="unmark"
, duplicated points are
determined by testing equality of their coordinates only,
using ==
.
If rule="deldir"
, duplicated points are
determined by testing equality of their coordinates only,
using the function duplicatedxy
in the package duplicated.data.frame
. Setting rule="deldir"
will ensure consistency with functions in the
ppp.object
,
unique.ppp
,
multiplicity.ppp
X <- ppp(c(1,1,0.5), c(2,2,1), window=square(3))
duplicated(X)
duplicated(X, rule="deldir")
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