dup.coords
Locates duplicated coordinates
This funtions takes an object with 2-D coordinates and returns the
positions of the duplicated coordinates. Also sets a method
for duplicated
Usage
dup.coords(x, …)
# S3 method for default
dup.coords(x, …)
# S3 method for geodata
dup.coords(x, incomparables, …)
# S3 method for geodata
duplicated(x, incomparables, …)Arguments
- x
a two column numeric matrix or data frame.
- incomparables
unused. Just for compatibility with the generic function
duplicated.- …
arguments passed to
sapply. Ifsimplify = TRUE(default) results are returned as an array if possible (when the number of replicates are the same at each replicated location)
Value
Function and methods returns NULL if there are no duplicates
locations.
Otherwise, the default method returns a list where each component is a vector with the positions or the rownames, if available, of the duplicates coordinates.
The method for geodata returns a data-frame with
rownames equals to the positions of the duplicated coordinates,
the first column is a factor indicating duplicates and
the remaning are output of as.data.frame.geodata.
See Also
as.geodata for the definition of geodata class,
duplicated for the base function to identify duplicated
values and jitterDupCoords for a function which jitters
duplicated coordinates.
Examples
# NOT RUN {
## simulating data
dt <- grf(30, cov.p=c(1, .3))
## "forcing" some duplicated locations
dt$coords[4,] <- dt$coords[14,] <- dt$coords[24,] <- dt$coords[2,]
dt$coords[17,] <- dt$coords[23,] <- dt$coords[8,]
## output of the method for geodata
dup.coords(dt)
## which is the same as a method for duplicated()
duplicated(dt)
## the default method:
dup.coords(dt$coords)
# }