| rev {base} | R Documentation |
Reverse Elements
Description
rev provides a reversed version of its argument. It is generic
function with a default method for vectors and one for
dendrograms.
To obtain a vector sorted in decreasing order efficiently, use
sort(x, decreasing = TRUE), not rev(sort(x)).
Usage
rev(x)
Arguments
x |
a vector or another object for which reversal is defined. |
References
Becker R. A., Chambers J. M., Wilks A. R. (1988). The New S Language. Chapman and Hall/CRC, London. ISBN 053409192X.
See Also
Examples
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
[Package base version 4.6.0 Index]