[R] concatenate values in the vector

[Erik Iverson]

Cristian Montes wrote:
> Even shorter is 
> 
> x<-c("a","b","c","d")
> paste(x, sep="+")

 > x<-c("a","b","c","d")
 > paste(x, sep="+")
[1] "a" "b" "c" "d"