R: Reverse Elements of a Vector or the Rows/Columns of Matrices,...

Rev {DescTools}

R Documentation

Reverse Elements of a Vector or the Rows/Columns of Matrices, Tables or Data.frames

Description

Rev provides a reversed version of its argument. It wraps the base function rev and provides an additional method for matrices and higher dimensional tables, such as to reverse the order of rows and columns.

Usage

Rev(x, ...)

## S3 method for class 'matrix'
Rev(x, margin, ...)

## S3 method for class 'table'
Rev(x, margin, ...)

## S3 method for class 'data.frame'
Rev(x, margin, ...)

Arguments

`x`	a vector, a matrix or a higher dimensional table to be reversed.
`margin`	vector of dimensions which to be reversed (1 for rows, 2 for columns, etc.).
`...`	the dots are passed to the matrix, resp. table interface.

Author(s)

Andri Signorell <andri@signorell.net>

Examples

tab <- matrix( c( 1, 11, 111,
                  2, 22, 222,
                  3, 33, 333), byrow=TRUE, nrow=3)

Rev(tab, margin=1)
Rev(tab, margin=2)

# reverse both dimensions
Rev(tab, margin=c(1,2))