R: Find element

Find element {Rfast} | R Documentation

## Find element

### Description

Search a value in an unordered vector.

### Usage

    is_element(x, key)

### Arguments

`x` | A vector or matrix with the data.
`key` | A value to check if exists in the vector x.

### Details

Find if the key exists in the vector and return returns TRUE/FALSE if the value is been found. If the vector is unordered it is fast but if the vector is ordered then use binary_search. The functions is written in C++ in order to be as fast as possible.

### Value

TRUE/FALSE if the value is been found.

### Author(s)

Manos Papadakis

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

### See Also

`binary_search (buit-in R function)`

### Examples

    x <- rnorm(500)
    key <- x[50]
    b <- is_element(x, key)

[Package Rfast version 2.0.4 Index]