Rui Barradas wrote > > Sorry, but the output of dput() starts with 'structure', not like what > you've posted. > And there are much more than 20 dates in the beginning. > > The posting guide is easy to find >
apologies for my earlier ignorance. It seems the output of dput(head(data, 20) is too big to print in full. When I press stop immediately after pressing enter, I get: dput(head(long, 30)) structure(list(tripID = c(3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), device_info_serial = c(121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L), mdate = structure(c(33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, 33L, If I let it run just a little bit longer, it gives the enormous output like before. I made a new vector containing only the columns I need for this problem: > str(dat) List of 4 $ device_info_serial: int [1:34773] 121 121 121 121 121 121 121 121 121 121 ... $ hour : int [1:34773] 10 11 11 11 11 11 11 11 11 11 ... $ time : POSIXlt[1:34773], format: "2009-05-21 10:59:24" ... $ tripID : int [1:34773] 3 3 3 3 3 3 3 3 3 3 ... You were right about the factors. I think I solved it using: dat$time <- strptime(long$date_time.x, format = "%Y-%m-%d %H:%M:%S") this seems to help, as R doesn't start computing for hours. It does give an error though: > departures <- lapply(split(dat, list(dat$device_info_serial, dat$tripID)), > function(x) x[x$time == min(x$time),]) Error in x[x$time == min(x$time), ] : incorrect number of dimensions In addition: Warning messages: 1: In split.default(dat, list(dat$device_info_serial, dat$tripID)) : data length is not a multiple of split variable 2: In min(x$time) : no non-missing arguments to min; returning Inf -- View this message in context: http://r.789695.n4.nabble.com/noob-requesting-help-tp4632803p4633317.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
