[R] vectorization with subset?

[dlv04c]

Hello,

I have a data frame (68,000 rows) of scores (V4) for a series of [genomic]
coordinates ranges (V2 to V3).



I also have a data frame (1.2 million rows) of single [genomic] coordinates.  



For each genomic coordinate (in coord), I would like to determine the
average of all scores whose genomic ranges (in scores) encompass the
coordinate (in coord). To accomplish this, I tried:



The function works, but is extremely slow.

It would take about 4 days for this to finish for a single data set, and I
have 64 data sets.

Why does the rate at which coordinate averages are calculated increase when
coord is smaller, but not when scores is smaller?

How can I accomplish the same thing more efficiently?

Thanks,

Dan

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