| xtfrm {base} | R Documentation |
A generic auxiliary function that produces a numeric vector which
will sort in the same order as x.
xtfrm(x)
x |
an R object. |
This is a special case of ranking, but as a less general function than
rank is more suitable to be made generic. The default
method is equivalent to rank(x, ties.method="min",
na.last="keep"), so NA values are given rank NA and
all tied values are given equal integer rank.
The factor method extracts the codes. The
Surv method sorts first on times and then on
status code(s).
The default method will make use of == and > methods
for the class of x[i] (for integers i), and the
is.na method for the class of x, but might be rather
slow when doing so.
A numeric (usually integer) vector of the same length as x.