anti-filter.R

> df <- as.tbl(data.frame(x = c("a", "b", "c")))
> df
# A tibble: 3 × 1
       x
  <fctr>
1      a
2      b
3      c
> df %>% filter(x == "a")
# A tibble: 1 × 1
       x
  <fctr>
1      a
> df %>% filter(x != "a")
# A tibble: 2 × 1
       x
  <fctr>
1      b
2      c