uniqueL {sfsmisc} | R Documentation |
A Reversable Version of unique()
Description
A version of unique
keeping enough information to
reverse (or invert) to the original data.
Usage
uniqueL(x, isuniq = !duplicated(x), need.sort = is.unsorted(x))
Arguments
x |
numeric vector, of length |
isuniq |
logical vector of the same length as |
need.sort |
logical indicating if |
Value
list of two components,
ix |
integer vector of indices |
xU |
vector of values from |
such that both x[isuniq] === xU
and xU[ix] === x
.
Author(s)
Martin Maechler
See Also
Duplicated
from the sfsmisc package in
addition to the standard unique
and
duplicated
.
Examples
x0 <- c(1:3,2:7,8:4)
str(r0 <- uniqueL(x0))
with(r0, xU[ix]) ## == x0 !
[Package sfsmisc version 1.1-18 Index]