Locates duplicated coordinates

Description

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, ...)
## Default S3 method:
dup.coords(x, ...)
## S3 method for class 'geodata':
dup.coords(x, incomparables, ...)
## S3 method for class 'geodata':
duplicated(x, incomparables, ...)

Arguments

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.

Author(s)

Paulo Justiniano Ribeiro Jr. paulojus@leg.ufpr.br
Peter J. Diggle p.diggle@lancaster.ac.uk.

See Also

as.geodata, duplicated.

Examples

## 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)