You didn't show the entire call to read.table. If it included the argument header=TRUE then it would make the first entry in each column the name of the column. Use header=FALSE (or omit the header argument) if you don't want the first entry to be considered the column name.
-Bill On Wed, Dec 16, 2020 at 10:25 AM Gregory Coats via R-help < r-help@r-project.org> wrote: > I added a zero initial entry to the data set. Greg > gcdf<-read.table(text="2013-11-29 00.000 > 2013-12-29 19.175 > 2014-01-20 10.072 > 2014-02-12 10.241 > 2014-03-02 05.916 > > > On Dec 16, 2020, at 12:32 PM, Gregory Coats via R-help < > r-help@r-project.org> wrote: > > > > Jim, Thank you! > > The data set begins > > gcdf<-read.table(text="2013-12-29 19.175 > > 2014-01-20 10.072 > > 2014-02-12 10.241 > > I note that data begins in 2013. But the plot command does not show this > first entry in 2013, and instead shows the second data pair as the first > data pair. As a consequence, plot does not show the first data pair for > 2013, and begins in 2014. > > Greg > > > >> On Dec 16, 2020, at 1:08 AM, Jim Lemon <drjimle...@gmail.com> wrote: > >> > >> Hi Greg, > >> I think this does what you want: > >> > >> gcdf$date<-as.Date(gcdf$date,"%Y-%m-%d") > >> grid_dates<-as.Date(paste(2014:2020,1,1,sep="-"),"%Y-%m-%d") > >> plot(gcdf$date, gcdf$gallons, main="2014 Toyota 4Runner", xlab="Date", > >> ylab="Gallons",type="l",col="blue",yaxt="n") > >> abline(h=seq(4,20,by=2),lty=4) > >> abline(v=grid_dates,lty=4) > >> axis(side=2,at=seq(4,20,by=2)) > >> > >> Jim > >> > >> On Wed, Dec 16, 2020 at 2:16 PM Gregory Coats <gregco...@me.com> wrote: > >>> > >>> Jim, Thanks for your help with R. > >>> Feeding into R the file R_plot_18.r yields for me, on my Mac, > R_plot_18.pdf. Success. > >>> I used abline to draw a horizontal background grid, and then used axis > label to identify the values represented by the horizontal dashed > background lines. > >>> abline (h=c(2,4,6,8,10,12,14,16,18,20,22,24), lty=4, lwd=1.0, > col="grey60") > >>> Similarly, I would like to draw a dashed vertical background grid. But > it is unclear to me how to direct R to draw a vertical dashed background > grid because I am again baffled how to specify to R a date value such as > 2018-10-20 @18:00. I welcome your guidance. > >>> Greg > >>> > >>> On Dec 13, 2020, at 10:58 PM, Jim Lemon <drjimle...@gmail.com> wrote: > >>> > >>> Hi Gregory, > >>> > >>> On Mon, Dec 14, 2020 at 12:34 PM Gregory Coats <gregco...@me.com> > wrote: > >>> > >>> ... > >>> Is there a convenient way to tell R to interpret “2020-12-13” as a > date? > >>> > >>> Notice the as.Date command in the code I sent to you. this converts a > >>> string to a date with a resolution of one day. If you want a higher > >>> time resolution, use strptime or one of the other POSIX date > >>> conversion functions. > >>> > >>> Jim > > ______________________________________________ > 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. > [[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.
