Thank you Rui. I ran the following script
df1 <- read.table("solar_hour", header = TRUE)
df1$date <- as.Date(paste(df1$year, df1$hour),
format = "%Y %j",
origin = "2012-08-01-0")
df2 <- df1[c("date", "IMF", "SWS",
"SSN", "Dst", "f10")]
head(df1)
#To display all the rows
print(df2).
It gave me this error message> source ("script.R")
Error in `$<-.data.frame`(`*tmp*`, date, value = numeric(0)) :
replacement has 0 rows, data has 38735> print(df2)
Error: object 'df2' not found> My data is an hourly data but desire to have the date as
year month day hour
2012 08 01 01
2012 08 01 02
2012 08 01 03 etc
Thanks.
*Jibrin Adejoh Alhassan (Ph.D)*
Department of Physics and Astronomy,
University of Nigeria, Nsukka
On Sat, Jun 15, 2024 at 8:34?PM Rui Barradas <ruipbarradas at sapo.pt>
wrote:
> ?s 20:00 de 15/06/2024, Jibrin Alhassan escreveu:
> > I have solar-geophysical data e.g as blow:
> > YEAR DOY HR IMF SW SSN Dst f10.7
> > 2012 214 0 3.4 403. 132 -9 154.6
> > 2012 214 1 3.7 388. 132 -10 154.6
> > 2012 214 2 3.7 383. 132 -10 154.6
> > 2012 214 3 3.7 391. 132 -9 154.6
> > 2012 214 4 4.2 399. 132 -7 154.6
> > 2012 214 5 4.1 411. 132 -6 154.6
> > 2012 214 6 4.0 407. 132 -6 154.6
> > 2012 214 7 4.2 404. 132 -4 154.6
> > 2012 214 8 4.3 405. 132 -6 154.6
> > 2012 214 9 4.4 409. 132 -6 154.6
> > 2012 214 10 4.4 401. 132 -6 154.6
> > 2012 214 11 4.5 385. 132 -7 154.6
> > 2012 214 12 4.7 377. 132 -8 154.6
> > 2012 214 13 4.7 382. 132 -6 154.6
> > 2012 214 14 4.3 396. 132 -4 154.6
> > 2012 214 15 4.1 384. 132 -2 154.6
> > 2012 214 16 4.0 382. 132 -1 154.6
> > 2012 214 17 3.9 397. 132 0 154.6
> > 2012 214 18 3.8 390. 132 1 154.6
> > 2012 214 19 4.2 400. 132 2 154.6
> > 2012 214 20 4.6 408. 132 1 154.6
> > 2012 214 21 4.8 401. 132 -3 154.6
> > 2012 214 22 4.9 395. 132 -5 154.6
> > 2012 214 23 5.0 386. 132 -1 154.6
> > 2012 215 0 5.0 377. 143 -1 138.6
> > 2012 215 1 4.9 384. 143 -2 138.6
> > 2012 215 2 4.9 390. 143 -4 138.6
> > 2012 215 3 4.9 372. 143 -6 138.6
> > 2012 215 4 5.1 371. 143 -4 138.6
> > I want to process it to be of the format as shown below
> > y m d hr imf sws ssn Dst f10.7
> > 2012-08-01 10 3.4 403. 132 -9 154.6
> > 2012-08-01 12 3.7 388. 132 -10 154.6
> > 2012-08-01 15 3.7 383. 132 -10 154.6
> > 2012-08-01 17 3.7 391. 132 -9 154.6
> > I want to request an R code to accomplish this task. Thanks for your
> time.
> > *Jibrin Adejoh Alhassan (Ph.D)*
> > Department of Physics and Astronomy,
> > University of Nigeria, Nsukka
> >
> > [[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.
> Hello,
>
> To create a date column, paste the first two columns and coerce to class
> "Date" with conversion specifications %Y for the 4 digit year and
%j for
> the day of year. See
>
> help("strptime")
>
>
>
> df1 <- read.table(text = "YEAR DOY HR IMF SW SSN Dst f10.7
> 2012 214 0 3.4 403. 132 -9 154.6
> 2012 214 1 3.7 388. 132 -10 154.6
> 2012 214 2 3.7 383. 132 -10 154.6
> 2012 214 3 3.7 391. 132 -9 154.6
> 2012 214 4 4.2 399. 132 -7 154.6
> 2012 214 5 4.1 411. 132 -6 154.6
> 2012 214 6 4.0 407. 132 -6 154.6
> 2012 214 7 4.2 404. 132 -4 154.6
> 2012 214 8 4.3 405. 132 -6 154.6
> 2012 214 9 4.4 409. 132 -6 154.6
> 2012 214 10 4.4 401. 132 -6 154.6
> 2012 214 11 4.5 385. 132 -7 154.6
> 2012 214 12 4.7 377. 132 -8 154.6
> 2012 214 13 4.7 382. 132 -6 154.6
> 2012 214 14 4.3 396. 132 -4 154.6
> 2012 214 15 4.1 384. 132 -2 154.6
> 2012 214 16 4.0 382. 132 -1 154.6
> 2012 214 17 3.9 397. 132 0 154.6
> 2012 214 18 3.8 390. 132 1 154.6
> 2012 214 19 4.2 400. 132 2 154.6
> 2012 214 20 4.6 408. 132 1 154.6
> 2012 214 21 4.8 401. 132 -3 154.6
> 2012 214 22 4.9 395. 132 -5 154.6
> 2012 214 23 5.0 386. 132 -1 154.6
> 2012 215 0 5.0 377. 143 -1 138.6
> 2012 215 1 4.9 384. 143 -2 138.6
> 2012 215 2 4.9 390. 143 -4 138.6
> 2012 215 3 4.9 372. 143 -6 138.6
> 2012 215 4 5.1 371. 143 -4 138.6", header = TRUE)
>
>
> with(df1, paste(YEAR, DOY)) |> as.Date(format = "%Y %j")
> #> [1] "2012-08-01" "2012-08-01"
"2012-08-01" "2012-08-01" "2012-08-01"
> #> [6] "2012-08-01" "2012-08-01"
"2012-08-01" "2012-08-01" "2012-08-01"
> #> [11] "2012-08-01" "2012-08-01"
"2012-08-01" "2012-08-01" "2012-08-01"
> #> [16] "2012-08-01" "2012-08-01"
"2012-08-01" "2012-08-01" "2012-08-01"
> #> [21] "2012-08-01" "2012-08-01"
"2012-08-01" "2012-08-01" "2012-08-02"
> #> [26] "2012-08-02" "2012-08-02"
"2012-08-02" "2012-08-02"
>
> # now create the column
> df1$Date <- with(df1, paste(YEAR, DOY)) |> as.Date(format = "%Y
%j")
> # remove the columns no longer needed
> df1 <- df1[-(1:2)]
> # relocate the new date column
> df1 <- df1[c(ncol(df1), 1:(ncol(df1) - 1L))]
> head(df1)
> #> Date HR IMF SW SSN Dst f10.7
> #> 1 2012-08-01 0 3.4 403 132 -9 154.6
> #> 2 2012-08-01 1 3.7 388 132 -10 154.6
> #> 3 2012-08-01 2 3.7 383 132 -10 154.6
> #> 4 2012-08-01 3 3.7 391 132 -9 154.6
> #> 5 2012-08-01 4 4.2 399 132 -7 154.6
> #> 6 2012-08-01 5 4.1 411 132 -6 154.6
>
>
> Hope this helps,
>
> Rui Barradas
>
>
> --
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