Пост №16 ну же. блин!

The function match works on vectors :

> x <- sample(1:10)
> x
 [1]  4  5  9  3  8  1  6 10  7  2
> match(c(4,8),x)
[1] 1 5

match only returns the first encounter of a match, as you requested.
For multiple matching, %in% is the way to go :

> x <- sample(1:4,10,replace=T)
> x
 [1] 3 4 3 3 2 3 1 1 2 2
> which(x %in% c(2,4))
[1]  2  5  9 10