Hello Tom, Please find the details: (i have changed name from eir to a1, rest all is same) str(a1$date) Factor w/ 32 levels "05-30-16","05-31-16",..: 1 1 1 head(a1$date) 05-30-16 05-30-16 05-30-16 05-30-16 05-30-16 05-30-16 32 Levels: 05-30-16 05-31-16 06-01-16 06-02-16 06-03-16 06-04-16 06-05-16 06-06-16 06-07-16 06-08-16 Thanks again!!! On Tue, Jul 26, 2016 at 9:38 PM, Tom Wright <tom at maladmin.com> wrote:> Hi again Shiva, > I think what we need to see is the output from: > > str(eid$date) > > and perhaps > head(eid$date) > > If you can send this information before doing any processing on the date > (i.e. before the as.Date() function) we may be able to help. > > > > -----Original Message----- > From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Shivi > Bhatia > Sent: July 26, 2016 11:46 AM > To: David L Carlson <dcarlson at tamu.edu> > Cc: r-help <r-help at r-project.org> > Subject: Re: [R] Date Time in R > > 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 <dcarlson at 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:shivipmp82 at 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 <dcarlson at 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-bounces at 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$date)- this results in :- > > Date[1:5327], format: NA NA NA NA NA. > > > > Thanks again. > > > > On Tue, Jul 26, 2016 at 5:58 PM, Marc Schwartz <marc_schwartz at me.com> > > wrote: > > > > > Hi, > > > > > > That eir$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 <shivipmp82 at 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 > > > > <shivipmp82 at 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.duncan at 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 at 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_mai > > lman_listinfo_r-2Dhelp&d=CwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=veMGHMCNZSh > > ld-KX-bIj4jRE_tP9ojUvB_Lqp0ieSdk&m=s9RjgM0-LqObg32B_ODUoHMjaBJSYFn0ccx > > orF0VRaQ&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.o > > rg_posting-2Dguide.html&d=CwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=veMGHMCNZS > > hld-KX-bIj4jRE_tP9ojUvB_Lqp0ieSdk&m=s9RjgM0-LqObg32B_ODUoHMjaBJSYFn0cc > > xorF0VRaQ&s=Ldb33UyU9KMUXEsxxzwItyCFjZInukICij2jo66xaKg&e=> > > and provide commented, minimal, self-contained, reproducible code. > > > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. >[[alternative HTML version deleted]]
So this looks correct so far.
# convert strings (or factors) to a date object
a1$date <- as.Date(a1$date, ?%m-%d-%y?)
# Note the date object is now displayed in the format %Y-%m-%d by default
# so no need for the mdy() or ymd() function
# extract the weekdays as number
weekdays <- wday(a1$date)
# note can?t have spaces in variable names
week_names <- wday(a1$date, label=TRUE)
*From:* Shivi Bhatia [mailto:shivipmp82 at gmail.com]
*Sent:* July 26, 2016 12:16 PM
*To:* Tom Wright <tom at maladmin.com>
*Cc:* David L Carlson <dcarlson at tamu.edu>; r-help <r-help at
r-project.org>
*Subject:* Re: [R] Date Time in R
Hello Tom,
Please find the details: (i have changed name from eir to a1, rest all is
same)
str(a1$date)
Factor w/ 32 levels "05-30-16","05-31-16",..: 1 1 1
head(a1$date)
05-30-16 05-30-16 05-30-16 05-30-16 05-30-16 05-30-16
32 Levels: 05-30-16 05-31-16 06-01-16 06-02-16 06-03-16 06-04-16 06-05-16
06-06-16 06-07-16 06-08-16
Thanks again!!!
On Tue, Jul 26, 2016 at 9:38 PM, Tom Wright <tom at maladmin.com> wrote:
Hi again Shiva,
I think what we need to see is the output from:
str(eid$date)
and perhaps
head(eid$date)
If you can send this information before doing any processing on the date
(i.e. before the as.Date() function) we may be able to help.
-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Shivi Bhatia
Sent: July 26, 2016 11:46 AM
To: David L Carlson <dcarlson at tamu.edu>
Cc: r-help <r-help at r-project.org>
Subject: Re: [R] Date Time in R
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 <dcarlson at 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:shivipmp82 at 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 <dcarlson at
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-bounces at 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$date)- this results in :-
> Date[1:5327], format: NA NA NA NA NA.
>
> Thanks again.
>
> On Tue, Jul 26, 2016 at 5:58 PM, Marc Schwartz <marc_schwartz at
me.com>
> wrote:
>
> > Hi,
> >
> > That eir$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 <shivipmp82 at
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
> > > <shivipmp82 at 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.duncan at 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 at 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_mai
>
lman_listinfo_r-2Dhelp&d=CwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=veMGHMCNZSh
> ld-KX-bIj4jRE_tP9ojUvB_Lqp0ieSdk&m=s9RjgM0-LqObg32B_ODUoHMjaBJSYFn0ccx
> orF0VRaQ&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.o
>
rg_posting-2Dguide.html&d=CwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=veMGHMCNZS
> hld-KX-bIj4jRE_tP9ojUvB_Lqp0ieSdk&m=s9RjgM0-LqObg32B_ODUoHMjaBJSYFn0cc
> xorF0VRaQ&s=Ldb33UyU9KMUXEsxxzwItyCFjZInukICij2jo66xaKg&e=>
> and provide commented, minimal, self-contained, reproducible code.
>
>
>
[[alternative HTML version deleted]]
______________________________________________
R-help at 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.
[[alternative HTML version deleted]]
Thanks Tom for the recommendation. This is now working. Apologies if this sounds like a juvenile but i am not very good with dates in R. What i initially did when i saw date as factor and then tried converting with lot many transformation that is where it went bad. But thanks to all this is really what i wanted. On Tue, Jul 26, 2016 at 9:58 PM, Tom Wright <tom at maladmin.com> wrote:> So this looks correct so far. > > > > # convert strings (or factors) to a date object > > a1$date <- as.Date(a1$date, ?%m-%d-%y?) > > > > # Note the date object is now displayed in the format %Y-%m-%d by default > > # so no need for the mdy() or ymd() function > > > > # extract the weekdays as number > > weekdays <- wday(a1$date) > > > > # note can?t have spaces in variable names > > week_names <- wday(a1$date, label=TRUE) > > > > > > *From:* Shivi Bhatia [mailto:shivipmp82 at gmail.com] > *Sent:* July 26, 2016 12:16 PM > *To:* Tom Wright <tom at maladmin.com> > *Cc:* David L Carlson <dcarlson at tamu.edu>; r-help <r-help at r-project.org> > > *Subject:* Re: [R] Date Time in R > > > > Hello Tom, > > > > Please find the details: (i have changed name from eir to a1, rest all is > same) > > > > str(a1$date) > > Factor w/ 32 levels "05-30-16","05-31-16",..: 1 1 1 > > > > head(a1$date) > > 05-30-16 05-30-16 05-30-16 05-30-16 05-30-16 05-30-16 > > 32 Levels: 05-30-16 05-31-16 06-01-16 06-02-16 06-03-16 06-04-16 06-05-16 > 06-06-16 06-07-16 06-08-16 > > > > Thanks again!!! > > > > On Tue, Jul 26, 2016 at 9:38 PM, Tom Wright <tom at maladmin.com> wrote: > > Hi again Shiva, > I think what we need to see is the output from: > > str(eid$date) > > and perhaps > head(eid$date) > > If you can send this information before doing any processing on the date > (i.e. before the as.Date() function) we may be able to help. > > > > -----Original Message----- > From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Shivi > Bhatia > Sent: July 26, 2016 11:46 AM > To: David L Carlson <dcarlson at tamu.edu> > Cc: r-help <r-help at r-project.org> > Subject: Re: [R] Date Time in R > > 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 <dcarlson at 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:shivipmp82 at 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 <dcarlson at 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-bounces at 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$date)- this results in :- > > Date[1:5327], format: NA NA NA NA NA. > > > > Thanks again. > > > > On Tue, Jul 26, 2016 at 5:58 PM, Marc Schwartz <marc_schwartz at me.com> > > wrote: > > > > > Hi, > > > > > > That eir$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 <shivipmp82 at 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 > > > > <shivipmp82 at 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.duncan at 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 at 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_mai > > lman_listinfo_r-2Dhelp&d=CwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=veMGHMCNZSh > > ld-KX-bIj4jRE_tP9ojUvB_Lqp0ieSdk&m=s9RjgM0-LqObg32B_ODUoHMjaBJSYFn0ccx > > orF0VRaQ&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.o > > rg_posting-2Dguide.html&d=CwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=veMGHMCNZS > > hld-KX-bIj4jRE_tP9ojUvB_Lqp0ieSdk&m=s9RjgM0-LqObg32B_ODUoHMjaBJSYFn0cc > > xorF0VRaQ&s=Ldb33UyU9KMUXEsxxzwItyCFjZInukICij2jo66xaKg&e=> > > > and provide commented, minimal, self-contained, reproducible code. > > > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. > > >[[alternative HTML version deleted]]