Internal auxiliary functions for use with data frames.
xpdrows.data.frame(x, old.rows, new.rows)
object of class
row names for old and new rows.
xpdrows.data.frame is an auxiliary function which expands the
rows of a data frame. It is used by the data frame methods of
[[<- (which perform subscripted assignments on a
data frame), and not intended to be called directly.
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