Uwe Ligges <ligges <at> statistik.uni-dortmund.de> writes: > Matthew Dowle wrote: > > > >>table(is.weekend(sapply(1:100, function(i){Sys.sleep(0.05);Sys.time()}))) > > > > FALSE TRUE > > 68 32 > > > It seems is.weekend() is unsure ? > > It is completely sure, if an object is given is.weekend() knows about as in: > > table(is.weekend(sapply(1:100, > function(i){Sys.sleep(0.05);as.chron(Sys.time())}))) > > (note the as.chron() call!)
Note that converting a POSIXct to chron using as.chron uses the GMT datetime, not the datetime in your timezone. So if its the weekend in the GMT timezone but not in yours it will indicate that its the weekend. Similarly if its the weekend in your timezone but not in the GMT timezone then it will indicate its not in the weekend. If you want the result relative to your timezone convert to chron like this: now <- Sys.time() chron(unclass(as.Date(format(now)))) or even easier: chron(unclass(Sys.Date())) Now apply is.weekend to that. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html