See ?date-time and/or ?strptime for how to convert what I presume is character data in your datetime column to a POSIXct object. (you may first need to convert from a factor to character with as.character() ). Then follow Tim's prescription for ggplot or see ?axis.Date (especially the examples) for how to do it with base R plots.
Cheers, Bert On Mon, Sep 19, 2022 at 5:15 AM Ebert,Timothy Aaron <teb...@ufl.edu> wrote: > My version of this email has a bunch of ? that I do not know how to > interpret. Emails to this group need to be in plain text. HTML content is > deleted or converted and impossible or at least difficult to interpret. > > Do not share confidential data. Please change some numbers or variable > names and share that. > If this helps: > 1) Make sure your time variable is a datetime object. > 2) At least in ggplot it should now behave as expected. > ggplot(df, aes(y=NO2, x=datetime)) + geom_point() > > That will be a start as a scatterplot, but the graph can be customized or > changed if scatterplot was not desired. > > Tim > > -----Original Message----- > From: R-help <r-help-boun...@r-project.org> On Behalf Of Parkhurst, David > Sent: Sunday, September 18, 2022 4:27 PM > To: r-help@r-project.org > Subject: [R] Need help plotting > > [External Email] > > I�ve been retired since �06 and have forgotten most of R. Now I have a > use for it, with some data from Bloomington�s Environmental Commission. > > I have a dataframe (obtained from read.csv) that contains numerous > columns, including time (in Excel�s 18:00 format), and DNO2, and MNO2 from > two air quality instruments. > > I�d like a plot of both the NO2 measurements against time. I be happy to > use either ordinary R plots or ggplot2 ones, if that would be a better > way. I�d much appreciate help. > > [[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. > [[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.