Thanks for all the help guys.
This worked for me:
all6 <- arrange(all6, tdate,event_tim)
lt <- ddply(all6,.(tdate),tail,1)
lt$last_trans <-'Y'
all6 <-merge(all6,lt, by.x=c("tdate","event_tim"),
by.y=c("tdate","event_tim"),all.x=TRUE)
--
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