[R] Group by

ManInMoon xmoon2000 at googlemail.com
Thu Mar 11 20:22:27 CET 2010

My point is this:

if we do


aggregate(DF[,c('V2', 'V3')], 
          list(format(temp, "%H:%M:00")), 
          FUN = sum) 

Does agrregate still know it's refering to DF$V1 - and if so- how?

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