

x<-"hello"
y<-"world!"
paste(x,y) 


> x<-"2001"
> y<-2009
> z<-data.frame(x,y,stringsAsFactors=FALSE)
> z
     x    y
1 2001 2009
> z[1,1]
[1] "2001"
> z[1,2]
[1] 2009

