rev

0th

Percentile

Reverse Elements

rev provides a reversed version of its argument. It is generic function with a default method for vectors and one for dendrograms.

Note that this is no longer needed (nor efficient) for obtaining vectors sorted into descending order, since that is now rather more directly achievable by sort(x, decreasing = TRUE).

Keywords
manip
Usage
rev(x)
Arguments
x

a vector or another object for which reversal is defined.

References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

See Also

seq, sort.

Aliases
  • rev
  • rev.default
Examples
library(base) x <- c(1:5, 5:3) ## sort into descending order; first more efficiently: stopifnot(sort(x, decreasing = TRUE) == rev(sort(x))) stopifnot(rev(1:7) == 7:1) #- don't need 'rev' here
Documentation reproduced from package base, version 3.4.1, License: Part of R 3.4.1

Community examples

marti.cadek@gmail.com at Apr 5, 2017 base v3.3.3

# My Favourite Animals animals_ls = list(animals = c("Dog", "Elephant", "T-Rex"), intuitive_size = c("Small", "Medium", "Huge"), speed_in_km = c(55,40,40)) animals_ls # My Favourite Animals in reversed order reversed_animals_ls = rev(animals_ls) # Is it the same? identical(animals_ls, reversed_animals_ls) identical(animals_ls, animals_ls)