This function takes an object with 2-D coordinates and returns
the positions of the duplicated coordinates. Also sets a method for
duplicated. Helper function for
Two column numeric matrix or data frame
passed to sapply. If simplify = TRUE (default) results are returned as an array if possible (when the number of replicates are the same at each replicated location)
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 remaining are output of as.data.frame.geodata.
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