Auxiliary Function for Matching

Description

Transform objects for matching via match(), think “match form” -> "mtfrm". base provides the S3 generic and a default plus "POSIXct" and "POSIXlt" methods.

Usage

mtfrm(x)

Arguments

Details

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).

Value

A vector of the same length as x.