Need help plotting
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 <tebert at 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
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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 at r-project.org> On Behalf Of Parkhurst, David
Sent: Sunday, September 18, 2022 4:27 PM
To: r-help at 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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