r - Defining events that happen at the same time as one event -


this question has answer here:

i have time-series of events:

time <-c("01-01-1970","01-01-1971","01-01-1971","01-01-1972") event <-c("a","a","b","b")  df <- data.frame(time, event)  time event 1 01-01-1970     2 01-01-1971     3 01-01-1971     b 4 01-01-1972     b

now, put events happen @ same time in 1 line. in example rows 2 , 3. outcome should this:

time event

1 01-01-1970     2 01-01-1971     & b 4 01-01-1972     b

any ideas how this?

best, felix

you can use aggregate:

aggregate(df$event,by=list(df$time),fun= paste,collapse = " & ")

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