[R] Manipulating dataframe

[Ravi Varadhan]

Hi:

Suppose, I have a dataframe (with N rows) containing the following 
variables:

ID  X82  X85  X88 

>From this, I'd like to create a new dataframe (with 3*N rows), which 
will have the following variables:

ID  X82  X85  X88  Xrep

where: each ID is duplicated 3 times; X82 equals its original value for 
the first row and equals NA for the other two; X85 equals its original 
value for the second row and equals NA for the other two; X88 equals 
its original value for the third row and equals NA for the other two; 
Xrep will equal X82, X85 and X88 in the first, second and third rows, 
respectively.

Is there an efficient way to do this?

Thanks for any help,
Ravi.


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