[R] Help processing large data

[mitras]

Dear all,
  I have one problem to handle a large dataset...
It looks like:
"read" "no" "length"
2 2 144
7 7 47490
9 9 310944
11 11 10089
14 14 13152
17 17 27363 and so on
There are 130000 rows

>From this table I need to make a table like 
2_1 2 100
2_2 2 44
7_1 7 100
7_2 7 100
...
...
7_474 7 100
7_475 7 90
9_1 9 100
9_2 9 100 and so on...

In words: I want to divide the 3rd column by 100  to keep the length 100 and
increasing no of rows needed, where no will be same for all increased rows,
but the read will be changed like 2_1,2_2 and so on..
Please let me know if any one can help.
Thanks a lot in advance.
Best,
Mitra.
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