Opposite of %in%

Question

A categorical variable V1 in a data frame D1 can have values represented by the letters from A to Z. I want to create a subset D2, which excludes some values, say, B, N and T. Basically, I want a command which is the opposite of %in%

D2 = subset(D1, V1 %in% c('B','N',T'))

Answer 1

To perform the opposite operation of %in% operator, use the following :

D2 = subset(D1, !(V1 %in% c('B','N','T')))

OR

'%ni%' <- Negate('%in%')

D2 = subset(D1, V1 %ni% c('B','N',T'))