Replace values in vector where not %in% vector

Question

Short question:

I can substitute certain variable values like this:

values <- c(\"a\", \"b\", \"a\", \"b\", \"c\", \"a\", \"b\")
df <- data.frame(v         


        

Answer 1

What about:

df[!df[, 1] %in% c("a", "b"), ] <- "x"

  values
1      a
2      b
3      a
4      b
5      x
6      a
7      b