[R] Need help plotting

Bert Gunter bgunter@4567 @end|ng |rom gm@||@com
Mon Sep 19 16:56:33 CEST 2022

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.


On Mon, Sep 19, 2022 at 5:15 AM Ebert,Timothy Aaron <tebert using 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-bounces using r-project.org> On Behalf Of Parkhurst, David
> Sent: Sunday, September 18, 2022 4:27 PM
> To: r-help using 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.
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