[R] Extending my code

[Jeff Newmiller]

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 <giftedlife2014 using 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 <giftedlife2014 using 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
><giftedlife2014 using 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$datetime <- with( dta, as.POSIXct(ISOdatetime(year,
>month,day,hour,0,0)))
>> > Error in with(dta, as.POSIXct(ISOdatetime(year, month, day, hour,
>0, 0))) :
>> >   object 'dta' not found
>> >
>> > Thanks for another time.
>> > Best
>> > Ogbos
>> >
>> > On Fri, Feb 15, 2019 at 7:51 AM Jeff Newmiller
><jdnewmil using dcn.davis.ca.us> wrote:
>> > >
>> > > The Date class is not designed to handle time... you need to use
>the ISOdatetime function and convert to POSIXct instead of Date. Just
>be sure to set your timezone to some appropriate value before you
>convert any times into datetime types.
>> > >
>> > > Sys.setenv( TZ="GMT" )
>> > > # avoid using `data` as that is the name of a base R function
>> > > dta <- read.table("CALG.txt", col.names = c("year", "month",
>"day", "hour", "counts"))
>> > > dta$year <- with( dta, ifelse(year < 50, year + 2000, year +
>1900)
>> > > dta$datetime <- with( dta, as.POSIXct(ISOdatetime(year,
>month,day,hour,0,0)))
>> > >
>> > > I don't see why you feel obliged to copy the timestamp out of the
>data frame into x, but that is your business.
>> > >
>> > > Appropriate timezone values can be reviewed with the OlsonNames()
>function.
>> > >
>> > >
>> > > On February 14, 2019 10:29:58 PM PST, Ogbos Okike
><giftedlife2014 using gmail.com> wrote:
>> > > >Dear List,
>> > > >I have a simple code with which I convert year, month, and day
>to a
>> > > >date format.
>> > > >My data looks like:
>> > > >67 01 26    18464
>> > > >67 01 26    18472
>> > > >67 01 26    18408
>> > > >67 01 26    18360
>> > > >67 01 26    18328
>> > > >67 01 26    18320
>> > > >67 01 26    18296
>> > > >
>> > > >while my code is:
>> > > >
>> > > >
>> > > >data <- read.table("CALG.txt", col.names = c("year", "month",
>"day",
>> > > >"counts"))
>> > > > new.century <- data$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 using 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.