R help - Apr 2010 - a question related to table output

Hi,

I have a data.frame object:
> a.df
   Methods     Score
1 Northern 1.3544227
2 Northern 0.8302436
3   RT-PCR 1.0011360
4   RT-PCR 1.1149423

If I write it out with write.table,
> write.table(a.df, file = 'data.txt', quote = FALSE, sep =
'\t', row.names
= FALSE)

the data.txt is looks like:

Methods    Score
Northern    1.35442268939541
Northern    0.830243615689926
RT-PCR    1.00113601434407
RT-PCR    1.11494230904995

My question is, can I merge the two "Northern" entries into one cell,
like
the "Merge Cells" in MS Excel ?

Best,
Zhenjiang

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