[R] Append to a vector?

[rkevinburton at charter.net]

This is probably an extemly easy operation I just could not find out how to do it.

I simple want to append to a vector. 

a <- c(1,2,3,4)
a <- union(a, c(5))

I want to append the value 5 or even another vector. Or is the a "better" way?

Kevin