R: Index of the columns of a data.frame which are a specific...

Index of the columns of a data.frame which are a specific type {Rfast} | R Documentation

## Index of the columns of a data.frame which are a specific type

### Description

Index of the columns of a data.frame which are a specific type.

### Usage

    which.is(x,method="factor")

### Arguments

`x` | A data.frame where some columns are expected to be factor variables.
`method` | A character value about the type. One of, "numeric","factor","integer","logical".

### Details

The function is written in C++ and this is why it is very fast.

### Value

A vector with the column indices which are factor variables. If there are no factor variables it will return an empty vector.

### Author(s)

Manos Papadakis <papadakm95@gmail.com>

R implementation and documentation: Manos Papadakis <papadakm95@gmail.com>.

### See Also

`nth, Match`

### Examples

    res<-which.is(iris)

[Package Rfast version 2.0.0 Index]