Jim Lemon wrote: > > On 02/16/2010 09:47 PM, Alex Anderson wrote: >> ... > This is the problem >> 6 96.88 2008/04/24 24:00 >> >> Error in `$<-.data.frame`(`*tmp*`, "time2", value = list(sec = c(0, 0, : >> replacement has 9 rows, data has 10 > > Hi Alex, > You have a problem with an invalid time. The line should read: > > 6 96.88 2008/05/24 00:00 > > However, there is something else going on here that puzzles me. When I > tried this with your sample data: > > tdata$datetime<-strptime(paste(tdata$date,tdata$time,sep="-"),"%Y/%m/%d-%H:%M") > Error in `$<-.data.frame`(`*tmp*`, "datetime", value = list(sec = c(0, : > replacement has 9 rows, data has 6 > > Yet: > > datetime<-strptime(paste(tdata$date,tdata$time,sep="-"), > "%Y/%m/%d-%H:%M") > datetime > [1] "2008-04-24 02:00:00" "2008-04-24 04:00:00" "2008-04-24 06:00:00" > [4] "2008-04-24 08:00:00" "2008-04-24 10:00:00" "2008-05-24 00:00:00" > length(datetime) > [1] 9 > > This is the first time I have encountered a discrepancy between "length" > and the printed extent of an object, and I can't work out what is going > on. > > Jim >
This is because you are working with a POSIXlt object which has 9 components and therefore always has a length of 9. That second part has always struck me as an odd design decision-- but one which we will have to live with. The important detail is that each component of POSIXlt, such as "min", are the length you would expect them to be. I.E. if you have a POSIXlt object storing 15 timestamps: length( object ) = 9 <- not what you expect length( object$min ) = 15 <- what you expect If it gets too confusing, just coerce your POSIXlt objects to POSIXct objects which don't have issues with odd lengths. Hope this helps! -Charlie -- View this message in context: http://n4.nabble.com/converting-character-vector-hh-mm-to-chron-or-strptime-24-clock-time-vectors-tp1557308p1558213.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.