matmax {geometry}

Row-wise matrix functions

Description

Compute maximum or minimum of each row, or sort each row of a matrix, or a set of (equal length) vectors.

Usage

matmax(...)

Arguments

...

A numeric matrix or a set of numeric vectors (that are column-wise bind together into a matrix with cbind).

Value

matmin and matmax return a vector of length nrow(cbind(...)). matsort returns a matrix of dimension dim(cbind(...)) with in each row of cbind(...) sorted. matsort(x) is a lot faster than, e.g., t(apply(x,1,sort)), if x is tall (i.e., nrow(x)>>ncol(x) and ncol(x)<30. If ncol(x)>30 then matsort simply calls 't(apply(x,1,sort))'. matorder returns a permutation which rearranges its first argument into ascending order, breaking ties by further arguments.

Author(s)

Raoul Grasman

Examples

example(Unique)