Reverse a Matrix by Rows, Columns or Both

Reverses the order of entire matrix rows, columns or both.

Usage

revmat(x, type = c("byrow", "bycolumn", "byboth"))

Arguments

x

a matrix.

type

a character string specifying whether to reverse matrix rows, columns or both; must be one of "byrow" (default), "bycolumn" or "byboth". You can specify just the initial letter.

Value

A matrix of the same dimensions as x.

Details

Depending on the argument type, this function reverses the order of entire rows, columns or both of a matrix, including any dimnames if present.

See also

matrix, t

Other utils: const(), endstop(), marker(), op-min-max

Examples

 m <- matrix(1:9, nrow = 3, byrow = TRUE, dimnames = list(paste0("x", 1:3), paste0("y", 1:3)))

 m
#>    y1 y2 y3
#> x1  1  2  3
#> x2  4  5  6
#> x3  7  8  9
 revmat(m)
#>    y1 y2 y3
#> x3  7  8  9
#> x2  4  5  6
#> x1  1  2  3
 revmat(m, "bycol")
#>    y3 y2 y1
#> x1  3  2  1
#> x2  6  5  4
#> x3  9  8  7
 revmat(m, "byboth")
#>    y3 y2 y1
#> x3  9  8  7
#> x2  6  5  4
#> x1  3  2  1

 rm(m)