Helper function: Negation/Opposite of %in%

This helper function checks if elements of one vector are not found in another vector.

a %not_in% b

Arguments

a

vector or NULL: the values to be matched.

b

vector or NULL: the values to be matched against.

Value

A logical vector, indicating if a match was not located for each element of a. The values are TRUE or FALSE and never NA.

Examples

c(1,2,3) %not_in% c(3,4,5,6,7)
#> [1]  TRUE  TRUE FALSE

library(dplyr)
PlantGrowth %>% filter(group %not_in% c("ctrl", "trt2"))
#>    weight group
#> 1    4.81  trt1
#> 2    4.17  trt1
#> 3    4.41  trt1
#> 4    3.59  trt1
#> 5    5.87  trt1
#> 6    3.83  trt1
#> 7    6.03  trt1
#> 8    4.89  trt1
#> 9    4.32  trt1
#> 10   4.69  trt1