[R] How to make this for() loop memory efficient?

[iliketurtles]

Ray, your solution works and is indeed faster than mine!

It looks like it's going to take a few days to to 400,000 rows, still, which
is unfortunate.

Steve, thanks for your help, I'll definitely self-teach plyr and data.table. 

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Isaac
Research Assistant
Quantitative Finance Faculty, UTS
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