Hi Team, Please read wdy as wday it was mistakenly copied.
On Tue, Jul 26, 2016 at 9:15 PM, Shivi Bhatia <shivipm...@gmail.com> wrote: > Hi David please see the code and some reproducible data: > eir$date<- as.Date(eir$date,format = "%m-%d-%y") then i had used the > lubridate library to help with the dates: > install.packages("lubridate") > library(lubridate) > eir$date <- mdy(eir$date) > weekdays <- wdy(eir$date) > week names <- wdy(eir$date, label = TRUE) > > This the output from the file: > > structure(list(date = structure(c(NA_real_, NA_real_, NA_real_), class = > "Date"), > > month = structure(c(2L, 2L, 2L), .Label = c("Jun","May"), class = > "factor"), > > day = c(30L, 30L, 30L), > > weekday = structure(c(2L,2L, 2L), .Label = c("Fri", "Mon", "Sat", "Sun", > "Thu", "Tue","Wed"), class = "factor"), > > survey_rating = c(3L, 2L, 3L), query_status = c("Yes", "Don't know", > "No"), > > a = c("05-30-16", "05-30-16", "05-30-16")), .Names = c("date","month", > "day", "weekday", "survey_rating"), row.names = c(NA, 3L), class = > "data.frame") > > There are several other variables that i have removed which are not > relevant in this context. > > On Tue, Jul 26, 2016 at 8:55 PM, David L Carlson <dcarl...@tamu.edu> > wrote: > >> Show us the output, don’t just tell us what you are seeing. If the dates >> are correct in the csv file, show us the structure of the data frame you >> created with read.csv() and show the command(s) you used to convert the >> character data to date format. The solution is likely to be simple if you >> will cut/paste the R console and not just describe what is happening. >> >> >> >> David C >> >> >> >> *From:* Shivi Bhatia [mailto:shivipm...@gmail.com] >> *Sent:* Tuesday, July 26, 2016 10:08 AM >> *To:* David L Carlson >> >> *Subject:* Re: [R] Date Time in R >> >> >> >> Hi David, >> >> This gives the results accurately. The first line shows all the variable >> names and the rest shows all values stored for each of the variable. Here >> date is appearing as correct. >> >> >> >> Thanks, Shivi >> >> >> >> On Tue, Jul 26, 2016 at 7:39 PM, David L Carlson <dcarl...@tamu.edu> >> wrote: >> >> What does this produce? >> >> > readLines("YourCSVfilename.csv", n=5) >> >> If the data are in Excel, the date format used in .csv files is not >> always in the same as the format used when viewing dates in the spreadsheet. >> >> ------------------------------------- >> David L Carlson >> Department of Anthropology >> Texas A&M University >> College Station, TX 77840-4352 >> >> >> >> -----Original Message----- >> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Shivi >> Bhatia >> Sent: Tuesday, July 26, 2016 7:42 AM >> To: Marc Schwartz >> Cc: R-help >> Subject: Re: [R] Date Time in R >> >> Thanks Marc for the help. this really helps. >> I think there is some issue with the data saved in csv format for this >> variable as when i checked: >> str(eir$date)- this results in :- >> Date[1:5327], format: NA NA NA NA NA. >> >> Thanks again. >> >> On Tue, Jul 26, 2016 at 5:58 PM, Marc Schwartz <marc_schwa...@me.com> >> wrote: >> >> > Hi, >> > >> > That eir$date might be a factor is irrelevant. There is an as.Date() >> > method for factors, which does the factor to character coercion >> internally >> > and then calls as.Date.character() on the result. >> > >> > Using the example data below: >> > >> > eir <- data.frame(date = c("05-30-16", "05-30-16", "05-30-16", >> > "05-30-16", "05-30-16", "05-30-16")) >> > >> > > str(eir) >> > 'data.frame': 6 obs. of 1 variable: >> > $ date: Factor w/ 1 level "05-30-16": 1 1 1 1 1 1 >> > >> > > eir >> > date >> > 1 05-30-16 >> > 2 05-30-16 >> > 3 05-30-16 >> > 4 05-30-16 >> > 5 05-30-16 >> > 6 05-30-16 >> > >> > eir$date <- as.Date(eir$date, format = "%m-%d-%y") >> > >> > > str(eir) >> > 'data.frame': 6 obs. of 1 variable: >> > $ date: Date, format: "2016-05-30" ... >> > >> > > eir >> > date >> > 1 2016-05-30 >> > 2 2016-05-30 >> > 3 2016-05-30 >> > 4 2016-05-30 >> > 5 2016-05-30 >> > 6 2016-05-30 >> > >> > eir$days <- weekdays(eir$date) >> > >> > > str(eir) >> > 'data.frame': 6 obs. of 2 variables: >> > $ date: Date, format: "2016-05-30" ... >> > $ days: chr "Monday" "Monday" "Monday" "Monday" ... >> > >> > > eir >> > date days >> > 1 2016-05-30 Monday >> > 2 2016-05-30 Monday >> > 3 2016-05-30 Monday >> > 4 2016-05-30 Monday >> > 5 2016-05-30 Monday >> > 6 2016-05-30 Monday >> > >> > >> > I would check to be sure that you do not have any typos in your code. >> > >> > Regards, >> > >> > Marc Schwartz >> > >> > >> > > On Jul 26, 2016, at 6:58 AM, Shivi Bhatia <shivipm...@gmail.com> >> wrote: >> > > >> > > Hello Again, >> > > >> > > While i tried your solution as you suggested above it seems to be >> > working. >> > > Here is the output >> > > temp<- dput(head(eir$date)) >> > > c("05-30-16", "05-30-16", "05-30-16", "05-30-16", "05-30-16", >> "05-30-16") >> > > however it still shows class(eir$date) as character and hence i cannot >> > find >> > > weekdays from this variable. >> > > >> > > Sorry but i still dont understand in totality how R reads dates even >> > though >> > > have tried enough. >> > > >> > > Regards, Shivi >> > > >> > > >> > > On Tue, Jul 26, 2016 at 5:12 PM, Shivi Bhatia <shivipm...@gmail.com> >> > wrote: >> > > >> > >> Thanks Duncan for the quick response. I will check again as you >> > suggested. >> > >> If that doesn't work i will share a reproducible example. >> > >> >> > >> Thanks again!!!! >> > >> >> > >> On Tue, Jul 26, 2016 at 4:43 PM, Duncan Murdoch < >> > murdoch.dun...@gmail.com> >> > >> wrote: >> > >> >> > >>> On 26/07/2016 7:05 AM, Shivi Bhatia wrote: >> > >>> >> > >>>> Hi Team, >> > >>>> >> > >>>> This scenario may have come across a number of times however i >> checked >> > >>>> nabble & SO and couldn't find a solution hence request assistance. >> > >>>> >> > >>>> I have a date variable in my data-set eir. The class of this var >> was >> > >>>> character while i had read the file in r studio. Example of date - >> > >>>> 05-30-16 >> > >>>> >> > >>>> To change this i have used eir$date<- as.Date(eir$date, >> "%m-%d-%y"). >> > This >> > >>>> converts it to a date variable. However when i check few obs >> > >>>> with head(eir$date) all the results are <NA>. >> > >>>> >> > >>> >> > >>> I think you don't have character data like that, because I see >> > >>> >> > >>>> as.Date("05-30-16", "%m-%d-%y") >> > >>> [1] "2016-05-30" >> > >>> >> > >>> I'd guess eir$date is really a factor, because character data is >> > >>> frequently changed to factor automatically. If that's the case, >> this >> > >>> should work for the conversion: >> > >>> >> > >>> as.Date(as.character(eir$date), "%m-%d-%y") >> > >>> >> > >>> If that doesn't work, you'll need to post something reproducible. >> > >>> >> > >>> Duncan Murdoch >> > >>> >> > >>> I also need to create weekdays from this date variable but until i >> get >> > >>>> this >> > >>>> resolved i cant find a weekday. For weekday i have used: >> > >>>> eir$week<- (eir$date) >> > >>>> eir$week<- weekdays(as.Date(eir$week)) >> > >>>> class(eir$week) >> > >>>> eir$week<- as.factor(eir$week) >> > >>>> head(eir$week) >> > >>>> >> > >>>> Head of this eir$week results again as expected in <NA> but shows >> > Levels: >> > >>>> Friday Monday Saturday Sunday Thursday Tuesday Wednesday >> > >>>> >> > >>>> Not sure what i should do here. Kindly suggest. >> > >> > >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Dhelp&d=CwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=veMGHMCNZShld-KX-bIj4jRE_tP9ojUvB_Lqp0ieSdk&m=s9RjgM0-LqObg32B_ODUoHMjaBJSYFn0ccxorF0VRaQ&s=-2AvIVGKBvHIg4b3KBUCarOh98Mq95XbBM6rQR5o_Qw&e=> >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=CwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=veMGHMCNZShld-KX-bIj4jRE_tP9ojUvB_Lqp0ieSdk&m=s9RjgM0-LqObg32B_ODUoHMjaBJSYFn0ccxorF0VRaQ&s=Ldb33UyU9KMUXEsxxzwItyCFjZInukICij2jo66xaKg&e=> >> and provide commented, minimal, self-contained, reproducible code. >> >> >> > > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.