notin docs #5481 (#5729)

man/notin.Rd

@@ -1,33 +1,30 @@
 \name{notin}
 \alias{\%notin\%}
-
 \title{
 Convenience operator for checking if an example is not in a set of elements
 }
-
 \description{
-Check whether an object is absent from a table, i.e., the logical inverse of \code{\link[=base]{in}}.
+Check whether an object is absent from a table, i.e., the logical inverse of \code{\link[=base]{in}}. See examples on how missing values are being handled.
 }
-
 \usage{
 x \%notin\% table
 }
-
 \arguments{
    \item{x}{ Vector or \code{NULL}: the values to be matched. }
    \item{table}{ Vector or \code{NULL}: the values to be matched against. }
 }
-
-
 \value{
     Logical vector, \code{TRUE} for each element of \code{x} \emph{absent} from \code{table}, and \code{FALSE} for each element of \code{x} \emph{present} in \code{table}.
 }
-
 \seealso{ \code{\link[base]{match}}, \code{\link[data.table]{chmatch}}  }
-
-
 \examples{
   11 \%notin\% 1:10 # TRUE
   "a" \%notin\% c("a", "b") # FALSE
-}
 
+  ## NAs on the LHS
+  NA \%in\% 1:2
+  NA \%notin\% 1:2
+  ## NAs on the RHS
+  NA \%in\% c(1:2,NA)
+  NA \%notin\% c(1:2,NA)
+}