# R Identify Elements in One Vector that are not Contained in Another (2 Examples)

This article illustrates how to find out which values are contained in one vector, but not in a second vector in the R programming language.

## Introduction of Example Data

my_first_vector <- LETTERS[1:5] # Example vectors (characters) my_second_vector <- LETTERS[4:10] |

my_first_vector <- LETTERS[1:5] # Example vectors (characters) my_second_vector <- LETTERS[4:10]

## Example 1: Apply %in%-Operator to Find Values Contained Only in the First Vector

my_first_vector[my_first_vector %in% my_second_vector == FALSE] # Using %in% # "A" "B" "C" |

my_first_vector[my_first_vector %in% my_second_vector == FALSE] # Using %in% # "A" "B" "C"

## Example 2: Apply setdiff() Function to Find Values Contained Only in the First Vector

setdiff(my_first_vector, my_second_vector) # Using setdiff # "A" "B" "C" |

setdiff(my_first_vector, my_second_vector) # Using setdiff # "A" "B" "C"