> x<-as.Date(c("2005-07-01", > "2005-07-02","2005-07-03","2005-07-04","2005-07-05")) > weekdays(x) [1] "星期五" "星期六" "星期日" "星期一" "星期二"
> months(x) [1] "七月" "七月" "七月" "七月" "七月" ======= 2005-12-12 20:17:38 您在来信中写道:======= >Thanks! >That solves my problem for year numbers and month numbers >Any idea how to do this for week numbers? > >Regards, >Richard > >On 12/12/05, ronggui <[EMAIL PROTECTED]> wrote: >> This is one way to do it. >> > x<-c("2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05") >> > x >> [1] "2005-07-01" "2005-07-02" "2005-07-03" "2005-07-04" "2005-07-05" >> > substr(x,1,4) >> [1] "2005" "2005" "2005" "2005" "2005" >> > substr(x,6,7) >> [1] "07" "07" "07" "07" "07" >> > substr(x,9,10) >> [1] "01" "02" "03" "04" "05" >> > >> >> >> ======= 2005-12-12 20:06:00 您在来信中写道:======= >> >> >Hi, >> > >> >Given a frame with calendar date's: >> > >> >"2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05",etc. >> > >> >I want to extract the following from these dates: >> > >> >week number >> >month number >> >year number >> > >> >Any ideas how to accomplish this? >> > >> >Many thanks. >> > >> >Regards, >> >Richard >> > >> >______________________________________________ >> >R-help@stat.math.ethz.ch mailing list >> >https://stat.ethz.ch/mailman/listinfo/r-help >> >PLEASE do read the posting guide! >> >http://www.R-project.org/posting-guide.html >> >> = = = = = = = = = = = = = = = = = = = = >> >> >> >> >> >> 2005-12-12 >> >> ------ >> Deparment of Sociology >> Fudan University >> >> My new mail addres is [EMAIL PROTECTED] >> Blog:http://sociology.yculblog.com >> = = = = = = = = = = = = = = = = = = = = 2005-12-12 ------ Deparment of Sociology Fudan University My new mail addres is [EMAIL PROTECTED] Blog:http://sociology.yculblog.com
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