Find element {Rfast}

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 <[e-mail]>.

See Also

binary_search (buit-in R function)

Examples

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