[R] Apply function

[tedzzx]

Hi all

I am manipulating a datafram which has 3 variables.Such as:

1  2  3
4  5  6
.  
.
.
200  210  300

I also has a row index: index=c(100,200,250..300)
I want to find the sums of first 100 rows, then the sum from row 101 to row
200, then row 201 to row 250... the each end row is indicated by the index.

Can I use the apply function to do that? or any other way?

Thanks

Ted


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