[datatable-help] Select from second key but not first

Chris Neff caneff at gmail.com
Wed Jul 13 01:21:47 CEST 2011


Hi all,

I'm really new to data.table and something really simple has me stumped.

Lets say I have the following (but much bigger so timing matters)

dt = data.table(x=1:100,y=1:2,z=1:4,key="y,z")



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