Steven Sanderson does not want these things:
In R programming, data filtering and manipulation are needed skills for any developer. One of the most useful operations you’ll frequently encounter is checking whether elements are NOT present in a given set. While R doesn’t have a built-in “NOT IN” operator like SQL, we can easily create and use this functionality. This comprehensive guide will show you how to implement and use the “NOT IN” operator effectively in R.
Read on for examples of how to use %in% and its corollary ! (...) %in%.