not used, for compatibility with the generic method as.data.frame.
N
integer or list of integers setting elements of rings to extract.
R
integer or list of integers setting elements of rings to extract.
clusters.only
return only the slot clusters of x?
Value
If clusters.only = TRUE, the function will return only the slot clusters of x.
Otherwise, slots clusters and rings of x will be merged in a unique data frame. The columns of rings will be renamed adding a suffix like .N300.RInf.
N and R define the elements of rings to extract. If not specified (NULL), all the elements of rings will be included.