[R] How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day
Martin Maechler
m@ech|er @end|ng |rom @t@t@m@th@ethz@ch
Wed Jun 15 12:02:12 CEST 2022
>>>>> Ebert,Timothy Aaron
>>>>> on Wed, 15 Jun 2022 02:01:44 +0000 writes:
> You don't, or not exactly. You could make the three
> columns strings, then add them together. I would then use
> the lubridate package to convert to a date. The first
> four lines of code are just getting a bit of data into
> R. The lubridate package will also work with date-time
> objects if you have time.
> year<-rep("2021",4)
> month<-c(7,8,9,11)
> day<-c(25,27,26,4)
> fuel<-c(50.45, 61.48,59.07,55.40)
> df<-data.frame(year,month,day,fuel)
> df$day <-as.character(df$day)
> df$month<-as.character(df$month)
> df$date <- paste(year,"/",month,"/",day)
> library(lubridate)
> df$date<-ymd(df$date)
> Regards,
> Tim
Thank you, but
Jeff Newmiller's answer which was much shorter *and* only
used base R instead of an extra package was much more convincing to me.
Martin
> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Avi Gross via R-help
> Sent: Tuesday, June 14, 2022 10:00 PM
> To: r-help using r-project.org
> Cc: r-help using r-project.org
> Subject: Re: [R] How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day
> [External Email]
> Greg,
> It looks like you mean to have a data.frame containing the year as a column then Month, Day and something called Fuel.
> You only made a vector called Fuel, with no name as part of it and plotted it.
> So you did not expect any names, I assume.
> You probably want to combine the first three columns into holding some kind of date object with something like as.Date("2021-07-25") for each row and make a vector of those. Your data.frame might then contain two columns called Date and Fuel and you might use whatever plotting method to put Fuel on the Y axis and dates on the X axis or whatever makes sense. Plotting four independent columns will not work here.
> And note the NAMES go in with something like:
> mydata <- data.frame(Date=dates, Fuel=Fuel) I have not done all the work but hopefully this is helpful.
> -----Original Message-----
> From: Gregory Coats via R-help <r-help using r-project.org>
> To: Greg Comcast Coats <gregcoats using me.com>
> Cc: Marc Schwartz via R-help <r-help using r-project.org>
> Sent: Tue, Jun 14, 2022 9:08 pm
> Subject: [R] How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day
> # Column 1 is the Year
> # Column 2 is the Month
> # Column 3 is the Day
> # Column 4 is the Fuel
> Fuel <- c(50.45, 61.48, 59.07, 55.40, 30.63, 41.35, 32.81, 49.86, 62.99, 89.37) plot (Fuel)
> 2021 7 25 50.45
> 2021 8 27 61.48
> 2021 9 26 59.07
> 2021 11 4 55.40
> 2021 11 22 30.63
> 2021 11 26 41.35
> 2021 12 6 32.81
> 2022 1 14 49.86
> 2022 4 29 62.99
> 2022 6 11 89.37
> How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day?
> Greg Coats
> [[alternative HTML version deleted]]
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> and provide commented, minimal, self-contained, reproducible code.
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