Append data to vector form a column of a dataframe

Dear R-community,

When doing this:

test<-data.frame(a=c(1,2,3))
rbind(test$a, 3)

I expect something like:

1
2
3
2

but get:

    [,1] [,2] [,3]
[1,]    1    2    3
[2,]    2    2    2

the same for:

rbind(test[["a"]], 2)
or
rbind(as.vector(test[["a"]]), 2)
or
rbind(t(as.vector(test[["a"]])), 2)

Why is that and how do I extract the "values" from a dataframe to get the
desired result?

Thank you
Dom








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