unique.ppp
From spatstat v1.36-0
by Adrian Baddeley
Extract Unique Points from a Spatial Point Pattern
Removes any points that are identical to other points in a spatial point pattern.
Usage
## S3 method for class 'ppp':
unique(x, \dots, warn=FALSE) ## S3 method for class 'ppx':
unique(x, \dots, warn=FALSE)
Arguments
- x
- A spatial point pattern
(object of class
"ppp"
or"ppx"
). - ...
- Arguments passed to
duplicated.ppp
orduplicated.data.frame
. - warn
- Logical. If
TRUE
, issue a warning message if any duplicated points were found.
Details
These are methods for the generic function unique
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 removes duplicate points in x
,
and returns a point pattern.
Value
- Another point pattern object.
See Also
Examples
X <- ppp(c(1,1,0.5), c(2,2,1), window=square(3))
unique(X)
unique(X, rule="deldir")
Community examples
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