| mtfrm {base} | R Documentation |
A generic auxiliary function to transform objects for matching.
mtfrm(x)
x |
an R object |
Matching via match will use mtfrm to transform
internally classed objects (see is.object) to a vector
representation appropriate for matching. The default method performs
as.character if this preserves the length.
Ideally, methods for mtfrm should ensure that comparisons of
same-classed objects via match are consistent with those
employed by methods for duplicated/unique
and ==/!= (where applicable).
A vector of the same length as x.