R: Get specific columns/rows fo a matrix

Get specific columns/rows fo a matrix {Rfast} | R Documentation

## 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 <papadakm95@gmail.com>.

### 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

[Package Rfast version 2.0.4 Index]