rev: Reverse Elements

Description Usage Arguments References See Also Examples

Description

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).

Usage

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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.

Examples

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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

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