[R] any function in R similar to the "scan" function in SAS?

[karena]

I am wondering if there is any function in R that is similar to the "scan"
function in SAS.
I have a data.frame which has two columns as the following:
one   two
1      2
3      4
5      6

I used the "paste" function to create the third column: three <-
paste(one,'-',two,sep="")
so the data.frame is like this now:
one   two   three
1      2       1-2
3      4       3-4
5      6       5-6

My question is, is there any function in R that can do the opposite thing to
what "paste" does?
suppose I only have the third column "three" now, and I want to get the
first and second columns. If in SAS, I can do the following:
one = scan(three,1,'-')
two = scan(three,-1,'-')

How can I do this in R?

thank you,

karena
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