[R] match function or "=="

[bo]

Thank you very much for the help. 

I installed data.table package, but I keep getting the following warnings:

> setkey(DT,id,date)
Warning messages:
1: In `[.data.table`(deref(x), o) :
This R session is < 2.4.0. Please upgrade to 2.4.0+.

I'm using R 2.10, but why I keep getting warnings on upgrades. Thanks again.


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