[R] help with simple but massive data transformation

[clee]

I have data that looks like this:

start     end     value
1          4         2
5          8         1  
9         10        0


I want to transform the data so that it becomes:

startend     value
1               2
2               2
3               2
4               2
5               1
6               1
7               1
8               1
9               0
10             0

----
I've written a for loop that can do the transformation BUT I need to do this
on very large datasets (millions of rows).  Does anyone know of an R package
that has a function that can do this transformation?

Any help is much appreciated!

Thanks!
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