Jim has pointed out the strptime function, but you can use as.POSIXct function
also... so
as.POSIXct( "2005-03-13 09:00:00" )
as.POSIXct( "03/13/2005 9:00", format="%m/%d/%Y %H:%M" )
or other variations should work.
On February 16, 2019 5:41:29 PM PST, Ogbos Okike <giftedlife2...@gmail.com>
wrote:
>Dear Jeff,
>My error please and sorry about that.
>
> Not "1960-05-04 09:00:00".
>I meant to write as.Date("2005-03-13"),-9,"b") and "2005-03-13
>09:00:00".
>My problem is the additional time factor.
>
>I can text anywhere on my plot when dealing with yyyy/mm/dd but I can't
>handle the new yyyy/mm/dd/hh/mm/ss.
>
>Thank you for your patience.
>
>Best regards
>Ogbos.
>
>I have no idea how text(as.Date("2005-03-13"),-9,"b") would mark your
>plot
>> anywhere near 1960-05-04 09:00:00. Perhaps someone else does. Or
>perhaps
>> you can provide an actual minimal working example of what you had
>working
>> before you changed to POSIXct.
>>
>> On February 16, 2019 1:08:38 PM PST, Ogbos Okike
><giftedlife2...@gmail.com>
>> wrote:
>> >Dear Jeff,
>> >One more problem please.
>> >
>> >When I used as.Date(ISOdate(dta$year, dta$month, dta$day,dta$hour))
>to
>> >handle date, I could use text(as.Date("2005-03-13"),-9,"b") to label
>> >my plot.
>> >
>> >Now that I am using as.POSIXct(ISOdatetime(year,
>> >month,day,hour,0,0))), can you please tell me how to text "b" on the
>> >point corresponding with 1960-05-04 09:00:00 on my plot.
>> >
>> >Many thanks for your extra time.
>> >
>> >Best wishes
>> >Ogbos
>> >
>> >On Fri, Feb 15, 2019 at 8:25 AM Ogbos Okike
><giftedlife2...@gmail.com>
>> >wrote:
>> >>
>> >> Dear Jeff,
>> >>
>> >> Please hold.
>> >> It is begging to work. There was an error somewhere. One ")" is
>> >> missing and as I went back to check the lines one by one with
>cursor,
>> >> I stubbed on non matching bracket.
>> >>
>> >> I completed, run the code again and got some result.
>> >>
>> >> Will get back to you once I am through.
>> >>
>> >> Thanks in a hurry.
>> >> Best regards
>> >> Ogbos
>> >>
>> >>
>> >> On Fri, Feb 15, 2019 at 8:15 AM Ogbos Okike
>> ><giftedlife2...@gmail.com> wrote:
>> >> >
>> >> > Dear Jeff,
>> >> >
>> >> > Thank you so much.
>> >> >
>> >> > I ran the code but got an error message. I then try to run them
>> >line by line.
>> >> >
>> >> > The problem is in:
>> >> > dta$datetime <- with( dta, as.POSIXct(ISOdatetime(year,
>> >month,day,hour,0,0)))
>> >> > Error in with(dta, as.POSIXct(ISOdatetime(year, month, day,
>hour,
>> >0, 0))) :
>> >> > object 'dta' not found
>> >> >
>> >> > Thanks for another time.
>> >> > Best
>> >> > Ogbos
>> >> >
>> >> > On Fri, Feb 15, 2019 at 7:51 AM Jeff Newmiller
>> ><jdnew...@dcn.davis.ca.us> wrote:
>> >> > >
>> >> > > The Date class is not designed to handle time... you need to
>use
>> >the ISOdatetime function and convert to POSIXct instead of Date.
>Just
>> >be sure to set your timezone to some appropriate value before you
>> >convert any times into datetime types.
>> >> > >
>> >> > > Sys.setenv( TZ="GMT" )
>> >> > > # avoid using `data` as that is the name of a base R function
>> >> > > dta <- read.table("CALG.txt", col.names = c("year", "month",
>> >"day", "hour", "counts"))
>> >> > > dta$year <- with( dta, ifelse(year < 50, year + 2000, year +
>> >1900)
>> >> > > dta$datetime <- with( dta, as.POSIXct(ISOdatetime(year,
>> >month,day,hour,0,0)))
>> >> > >
>> >> > > I don't see why you feel obliged to copy the timestamp out of
>the
>> >data frame into x, but that is your business.
>> >> > >
>> >> > > Appropriate timezone values can be reviewed with the
>OlsonNames()
>> >function.
>> >> > >
>> >> > >
>> >> > > On February 14, 2019 10:29:58 PM PST, Ogbos Okike
>> ><giftedlife2...@gmail.com> wrote:
>> >> > > >Dear List,
>> >> > > >I have a simple code with which I convert year, month, and
>day
>> >to a
>> >> > > >date format.
>> >> > > >My data looks like:
>> >> > > >67 01 26 18464
>> >> > > >67 01 26 18472
>> >> > > >67 01 26 18408
>> >> > > >67 01 26 18360
>> >> > > >67 01 26 18328
>> >> > > >67 01 26 18320
>> >> > > >67 01 26 18296
>> >> > > >
>> >> > > >while my code is:
>> >> > > >
>> >> > > >
>> >> > > >data <- read.table("CALG.txt", col.names = c("year", "month",
>> >"day",
>> >> > > >"counts"))
>> >> > > > new.century <- data$year < 50
>> >> > > >data$year <- ifelse(new.century, data$year + 2000, data$year
>+
>> >1900)
>> >> > > >data$date <- as.Date(ISOdate(data$year, data$month,
>data$day))
>> >> > > >x = data$date
>> >> > > > y = data$counts
>> >> > > >
>> >> > > >I now wish to extend this code to be able to include hour for
>> >another
>> >> > > >data of the format:
>> >> > > >05 01 01 00 4009
>> >> > > >05 01 01 01 3969
>> >> > > >05 01 01 02 3946
>> >> > > >05 01 01 03 3975
>> >> > > >05 01 01 04 3960
>> >> > > >05 01 01 05 3974
>> >> > > >05 01 01 06 3971
>> >> > > >05 01 01 07 3970
>> >> > > >That is, I now would like to include hour in:
>> >> > > >data <- read.table("CALG.txt", col.names = c("year", "month",
>> >"day",
>> >> > > >"counts")).
>> >> > > >
>> >> > > >I am aware there are many other way of conversion but I have
>a
>> >> > > >specific interest here. This code is a preamble to a larger
>code
>> >and
>> >> > > >changing it to another format other than what I have will not
>be
>> >> > > >compatible with the general code. Or will rather be difficult
>> >for me
>> >> > > >to get another format fit into my main code.
>> >> > > >
>> >> > > >So if you would be kind enough to assist me to run the
>> >read.table in
>> >> > > >the format:
>> >> > > >
>> >> > > >data <- read.table("CALG.txt", col.names = c("year", "month",
>> >> > > >"day","hour", "counts"))
>> >> > > >
>> >> > > >and then run the rest as:
>> >> > > >
>> >> > > >new.century <- data$year < 50
>> >> > > >data$year <- ifelse(new.century, data$year + 2000, data$year
>+
>> >1900)
>> >> > > >data$date <- as.Date(ISOdate(data$year, data$month,
>> >> > > >data$day,data$hour))
>> >> > > >x = data$date
>> >> > > >
>> >> > > >such that year, month, day and hour will be stored in x,
>> >> > > >
>> >> > > >I will be very thankful.
>> >> > > >
>> >> > > >Thank you so much for your kind assistance.
>> >> > > >Best regards
>> >> > > >Ogbos
>> >> > > >
>> >> > > >______________________________________________
>> >> > > >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.
>> >> > >
>> >> > > --
>> >> > > Sent from my phone. Please excuse my brevity.
>>
>> --
>> Sent from my phone. Please excuse my brevity.
>>
>
> [[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.
--
Sent from my phone. Please excuse my brevity.
______________________________________________
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.
