Extending my code

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 at 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 at 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 at 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

--
Sent from my phone. Please excuse my brevity.