Hi David,
I'm back home again. Try this:
b<-read.table(text=
"Dtime DNO2 DVOC Dpm10 Dpm2.5 Dpm1 Mtime MNO2 MVOC Mpm10 Mpm2.5 Mpm1
18:00 28 164 81.34773 24.695435 14 18:00 19 151 3.000000 2 1
18:01 27 163 74.44034 23.751198 14 18:01 20 148 3.000000 2 1
18:02 30 160 72.21975 22.463129 13 18:02 19 150 3.000000 2 1",
header=TRUE,stringsAsFactors=FALSE)
b$POSIXtime<-strptime(paste("2022-09-20",b$Dtime),"%Y-%m-%d %H:%M")
png("DFPNO2.png")
plot(b$POSIXtime,b$DNO2,type="b",main="NO2 readings (2022-09-20)",
xlab="Date/time",ylab="NO2",ylim=range(c(b$DNO2,b$MNO2)),
pch=19,col="red")
points(b$POSIXtime,b$MNO2,type="b",pch=19,col="blue")
legend("center",legend=c("DNO2","MNO2"),pch=19,col=c("red","blue"))
dev.off()
If you have more than one day, it will show up on the x axis. You can
also format the tick labels if you want the full dates for only one
day.
Jim
PS thanks Avi
On Tue, Sep 20, 2022 at 4:49 PM Parkhurst, David <parkh...@indiana.edu> wrote:
>
> Thank you.
>
> DFP (iPad)
>
> > On Sep 19, 2022, at 8:15 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]]
> >
> ______________________________________________
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