R Equality while ignoring NAs

Question

Is there an equivalent of == but with the result that x != NA if x is not NA?

The following does what I want, but it's clunky:

mapply(identical, vec1, vec2)

Answer 1

Just replace "==" with %in%.

Example:

> df <- data.frame(col1= c("a", "b", NA), col2= 1:3)
> df
       col1 col2
    1    a    1
    2    b    2
    3 <NA>    3

> df[df$col1=="a", ]
       col1 col2
    1     a    1
    NA <NA>   NA

> df[df$col1%in%"a", ]
       col1 col2
    1    a    1

> "x"==NA
  [1] NA

> "x"%in%NA
  [1] FALSE