matrix_ops: Row- or Column-wise Re-ordering of Matrices

In tinycodet: Functions to Help in your Coding Etiquette

Row- or Column-wise Re-ordering of Matrices

Description

Infix operators for custom row- and column-wise re-ordering of matrices.

The x %row~% mat operator re-orders the elements of every row, each row ordered independently from the other rows, of matrix x, according to the ordering ranks given in matrix mat.

The x %col~% mat operator re-orders the elements of every column, each column ordered independently from the other columns, of matrix x, according to the ordering ranks given in matrix mat.

Note that these operators strip all attributes, except dimensions.

Usage

x %row~% mat

x %col~% mat

Arguments

x	a matrix
mat	a numeric matrix with the same dimensions as x, giving the new ordering ranks for every element of matrix x.

Value

A re-ordered matrix.

See Also

tinycodet_dry

Examples

# numeric matrix ====

x <- matrix(sample(1:25), nrow = 5)
print(x)
x %row~% x # sort elements of every row independently
x %row~% -x # reverse-sort elements of every row independently
x %col~% x # sort elements of every column independently
x %col~% -x # reverse-sort elements of every column independently

x <- matrix(sample(1:25), nrow = 5)
print(x)
mat <- sample(seq_along(x)) |> matrix(ncol = ncol(x))
x %row~% mat # randomly shuffle every row independently
x %col~% mat # randomly shuffle every column independently

# character matrix ====

x <- matrix(sample(letters, 25), nrow = 5)
print(x)
mat <- stringi::stri_rank(as.vector(x)) |> matrix(ncol = ncol(x))
x %row~% mat # sort elements of every row independently
x %row~% -mat # reverse-sort elements of every row independently
x %col~% mat # sort elements of every column independently
x %col~% -mat # reverse-sort elements of every column independently

x <- matrix(sample(letters, 25), nrow = 5)
print(x)
mat <- sample(seq_along(x)) |> matrix(ncol = ncol(x))
x %row~% mat # randomly shuffle every row independently
x %col~% mat # randomise shuffle every column independently

tinycodet documentation built on Feb. 21, 2026, 9:08 a.m.