columns: Get specific columns/rows fo a matrix

In Rfast: A Collection of Efficient and Extremely Fast R Functions

Get specific columns/rows fo a matrix

Description

Get specific columns/rows of a matrix.

Usage

columns(x,indices)
rows(x,indices)

Arguments

x	A matrix with data.
indices	An integer vector with the indices.

Value

A matrix with the specific columns/rows of argumment indices.

Author(s)

Manos Papadakis

R implementation and documentation: Manos Papadakis <[e-mail]>.

See Also

rowMins, rowFalse, nth, colrange, colMedians, colVars, colSort, rowSort, rowTrue

Examples

x <- matrix(runif(100*100),100,100)
indices = sample(1:100,50)
all.equal(x[,indices],columns(x,indices))
all.equal(x[indices,],rows(x,indices))

x<-indices<-NULL

Rfast documentation built on Nov. 9, 2023, 5:06 p.m.