[R] Group by

[ManInMoon]

My point is this:

if we do

temp<-tDates

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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