I have a workspace where I have study of the weather of every hour past one year (temperature, CO2 and stuff). What I need to do is split whole workspace depending on date (cause I have several 2009-01-01 etc) and in next step summarize the data for each day separetly (I'm looking for summary of every variable for every day separetly).
I was searching for some kind of function and have one, which is almoust good. Separating day works quite good, but summary is really bad.
df <- data.frame(date=rep(seq.POSIXt(as.POSIXct("2009-01-01"), by="day", length.out=31), each=1))
summary(split(df, as.Date(df$date),AM19))