The The R Primer logo Primer

Check if elements in one object are present in another object

You want to check which of the elements in a vector, matrix, list, or data frame are present in another vector, matrix, list or data frame

Solution: The %in% operator checks if each of the elements in the object on the left-hand side has a match among the elements in the object on the right-hand side.

See rule 2.6 in The R Primer for more information.

Back to tips.