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‘row.names’ can be stored internally in compact form.
‘.set_row_names(n)’ generates that form for automatic row names of
length ‘n’, to be assigned to ‘attr(, "row.names")’.
‘.row_names_info’ gives information on the internal form of the
row names for a data frame [depending on the value of]
the argument ‘type’.
Currently ‘type = 0’ returns the internal
‘"row.names"’ attribute (possibly ‘NULL’), ‘type = 2’ the
number of rows implied by the attribute, and ‘type = 1’ the
latter with a negative sign for ‘automatic’ row names.
See the help page for
row.names
and.row_names_info
. There are "automatic" and "compact" encodings, and possibly others.Further discussion on SO and R-devel mailing list on Nov 10, 2014.
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