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

Hello,

I have generated some new data to answer this question, please see the below code with in line comments.

# 2 vectors to make up a dataframe

V1 <- c('a','b','c','d','e','f','g')

V2 <- c(1,2,3,4,5,6,7)

# Create the dataframe using the 2 vectors 'V1' and 'V2'

D1 <- data.frame(V1,V2)

# Create a vector with the values that you want to exclude, in this case it is 'b' and 'c'.

excluded_values <- c('b','c')

# Use the '!' operator to exclude values in the 'subset' argument for the function 'subset'

D2 <- subset(D1, !(V1 %in% excluded_values))

## The below code will accomplish the task for your example

excluded_values <- c('B','N','T')

D2 <- subset(D1, !(V1 %in% excluded_values))