Omar André Gonzáles Díaz
2016-Apr-05 23:53 UTC
[R] Fwd: as.Date gives NAs when transforming from factor
Hi,
I would appreciate your help.
I?m having problems when transforming a column from ?factor? to ?date?.
It does not convert just: 31/03/2016 correctly, it out puts: NA.
04/04/2016 turns out as: 2016-04-04
02/04/2016 turns out as: 2016-02-04
31/03/2016 turns out as: NA
03/04/2016 turns out as: 2016-03-04.
Code:
a <- read.csv("dates.csv", stringsAsFactors = F)
a$Date <- as.Date(a$Date, format = "%m/%d/%Y")
Posible Solutions:
I?ve read here that it has to do with the Sys Locale, and the solution was
using: ?LC_TIME?, ?C?. But I didn?t have success.
http://stackoverflow.com/questions/15566875/as-date-returning-na-in-r
# Sys.getlocale("LC_TIME")
#
# Sys.setlocale("LC_TIME", "C")
Slds,
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Jeff Newmiller
2016-Apr-06 00:05 UTC
[R] Fwd: as.Date gives NAs when transforming from factor
Don't give a factor to as.Date. Convert it to character first, or avoid letting it become a factor in the first place by using the stringsAsFactors =FALSE option to the read.table function or its related functions. -- Sent from my phone. Please excuse my brevity. On April 5, 2016 4:53:56 PM PDT, "Omar Andr? Gonz?les D?az" <oma.gonzales at gmail.com> wrote:>Hi, > >I would appreciate your help. > >I?m having problems when transforming a column from ?factor? to >?date?. > > > >It does not convert just: 31/03/2016 correctly, it out puts: NA. > > > >04/04/2016 turns out as: 2016-04-04 > > > >02/04/2016 turns out as: 2016-02-04 > > > >31/03/2016 turns out as: NA > >03/04/2016 turns out as: 2016-03-04. > > > > > > > >Code: > >a <- read.csv("dates.csv", stringsAsFactors = F) > > > >a$Date <- as.Date(a$Date, format = "%m/%d/%Y") > > > > >Posible Solutions: > > > >I?ve read here that it has to do with the Sys Locale, and the solution >was >using: ?LC_TIME?, ?C?. But I didn?t have success. > >http://stackoverflow.com/questions/15566875/as-date-returning-na-in-r > > > > > > ># Sys.getlocale("LC_TIME") > ># > ># Sys.setlocale("LC_TIME", "C") > > > > > > > > > > > > >Slds, > > > > > > > > > > > >------------------------------------------------------------------------ >> Disclaimer The information in this email and any attachments may >contain >proprietary and privileged information that is intended for the >addressee(s) only. If you are not the intended recipient, you are >hereby >notified that any disclosure, copying, distribution, retention or use >of >the contents of this information is prohibited. When addressed to our >clients or vendors, any information contained in this e-mail or any >attachments is subject to the terms and conditions in any governing >contract. If you have received this e-mail in error, please immediately >contact the sender and delete the e-mail.. >______________________________________________ >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]]
Duncan Murdoch
2016-Apr-06 00:19 UTC
[R] Fwd: as.Date gives NAs when transforming from factor
On 05/04/2016 7:53 PM, Omar Andr? Gonz?les D?az wrote:> Hi, > > I would appreciate your help. > > I?m having problems when transforming a column from ?factor? to ?date?. > > > > It does not convert just: 31/03/2016 correctly, it out puts: NA. > > > > 04/04/2016 turns out as: 2016-04-04 > > > > 02/04/2016 turns out as: 2016-02-04 > > > > 31/03/2016 turns out as: NA > > 03/04/2016 turns out as: 2016-03-04. > > > > > > > > Code: > > a <- read.csv("dates.csv", stringsAsFactors = F) > > > > a$Date <- as.Date(a$Date, format = "%m/%d/%Y")You are specifying month/day/year format. There's no month 31. You probably want a$Date <- as.Date(a$Date, format = "%d/%m/%Y") Duncan Murdoch> > > > > Posible Solutions: > > > > I?ve read here that it has to do with the Sys Locale, and the solution was > using: ?LC_TIME?, ?C?. But I didn?t have success. > > http://stackoverflow.com/questions/15566875/as-date-returning-na-in-r > > > > > > > # Sys.getlocale("LC_TIME") > > # > > # Sys.setlocale("LC_TIME", "C") > > > > > > > > > > > > > Slds, > > > > > > > > > > > > ------------------------------------------------------------------------ >> Disclaimer The information in this email and any attachments may contain > proprietary and privileged information that is intended for the > addressee(s) only. If you are not the intended recipient, you are hereby > notified that any disclosure, copying, distribution, retention or use of > the contents of this information is prohibited. When addressed to our > clients or vendors, any information contained in this e-mail or any > attachments is subject to the terms and conditions in any governing > contract. If you have received this e-mail in error, please immediately > contact the sender and delete the e-mail.. > ______________________________________________ > 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. >
Hi I did not have problems transforming factors to dates, only when trying to transform nonexistent date.> as.Date(factor(c("31.3.2015", "29.2.2015")), format="%d.%m.%Y")[1] "2015-03-31" NA>Cheers Petr> -----Original Message----- > From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Jeff > Newmiller > Sent: Wednesday, April 6, 2016 2:05 AM > To: Omar Andr? Gonz?les D?az <oma.gonzales at gmail.com>; r-help at R- > project.org > Subject: Re: [R] Fwd: as.Date gives NAs when transforming from factor > > Don't give a factor to as.Date. Convert it to character first, or avoid letting it > become a factor in the first place by using the stringsAsFactors =FALSE option > to the read.table function or its related functions. > -- > Sent from my phone. Please excuse my brevity. > > On April 5, 2016 4:53:56 PM PDT, "Omar Andr? Gonz?les D?az" > <oma.gonzales at gmail.com> wrote: > >Hi, > > > >I would appreciate your help. > > > >I?m having problems when transforming a column from ?factor? to > >?date?. > > > > > > > >It does not convert just: 31/03/2016 correctly, it out puts: NA. > > > > > > > >04/04/2016 turns out as: 2016-04-04 > > > > > > > >02/04/2016 turns out as: 2016-02-04 > > > > > > > >31/03/2016 turns out as: NA > > > >03/04/2016 turns out as: 2016-03-04. > > > > > > > > > > > > > > > >Code: > > > >a <- read.csv("dates.csv", stringsAsFactors = F) > > > > > > > >a$Date <- as.Date(a$Date, format = "%m/%d/%Y") > > > > > > > > > >Posible Solutions: > > > > > > > >I?ve read here that it has to do with the Sys Locale, and the solution > >was > >using: ?LC_TIME?, ?C?. But I didn?t have success. > > > >http://stackoverflow.com/questions/15566875/as-date-returning-na-in-r > > > > > > > > > > > > > ># Sys.getlocale("LC_TIME") > > > ># > > > ># Sys.setlocale("LC_TIME", "C") > > > > > > > > > > > > > > > > > > > > > > > > > >Slds, > > > > > > > > > > > > > > > > > > > > > > > >----------------------------------------------------------------------- > >- > >> Disclaimer The information in this email and any attachments may > >contain > >proprietary and privileged information that is intended for the > >addressee(s) only. If you are not the intended recipient, you are > >hereby notified that any disclosure, copying, distribution, retention > >or use of the contents of this information is prohibited. When > >addressed to our clients or vendors, any information contained in this > >e-mail or any attachments is subject to the terms and conditions in any > >governing contract. If you have received this e-mail in error, please > >immediately contact the sender and delete the e-mail.. > >______________________________________________ > >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]] > > ______________________________________________ > 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.________________________________ Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m. 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