How can I create a vector containing the days of the week?

Question

I need a vector containing the days of the week very often, but I always type it out:

days.of.week <- c(\"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\",          


        

Answer 1

There you go, the vector of weekdays "Monday", ..., "Sunday":

days.of.week <- weekdays(x=as.Date(seq(7), origin="1950-01-01"))

Answer 2

Based on today's date we can also find days of a week

weekdays(as.Date(seq(7),origin=Sys.Date() - as.POSIXlt(Sys.Date())$wday ))
 [1] "Monday"    "Tuesday"   "Wednesday" "Thursday"  "Friday"    "Saturday" 
 [7] "Sunday"

Answer 3

One possibility:

days.of.week <- weekdays(Sys.Date()+0:6)

Always starting on Monday:

days.of.week <- weekdays(as.Date(4,"1970-01-01",tz="GMT")+0:6)

Or you could just define it as you have, but in your .Rprofile, so it's always available on startup.

Answer 4

While the function-based answers are slick, Joshua's last comment is spot-on. If you've got a variable you use regularly, either create it in your .Rprofile or load it from an .Rdata file, using some line in .Rprofile like load('daysofweek.rdata') .

Note that changing the first day of the week is as simple as

neworder <- days.of.week[c(2:7,1)]