[R] Shaded area

[Jim Lemon]

Hi all,
I was quite intrigued by George's question, for I thought this might
be a problem faced by many. The solution attached is only useful for a
monotonically increasing x vector, a paired vector of y values, and a
criterial value above which a polygon will be displayed. More work
would needed for curves that are above the criterial value at the
beginning or end, and a corresponding argument to fill the area
_below_ the criterial value. If it is useful, I can probably do a bit
more work on it.

Jim

On Fri, Mar 3, 2023 at 11:58 PM John Kane <jrkrideau using gmail.com> wrote:
>
> As Peter says, the list is very cautious about what types of files it
> allows. A handy way to supply some sample data is the dput() function.  In
> the case of a large dataset something like dput(head(mydata, 100)) should
> supply the data we need. Just do dput(mydata) where *mydata* is your data.
> Copy the output and paste it here.
>
> On Wed, 1 Mar 2023 at 09:58, PIKAL Petr <petr.pikal using precheza.cz> wrote:
>
> > Hallo
> >
> > Excel attachment is not allowed here, but shading area is answered many
> > times elsewhere. Use something like . "shading area r" in google.
> >
> > See eg.
> > https://www.geeksforgeeks.org/how-to-shade-a-graph-in-r/
> >
> > Cheers Petr
> >
> > -----Original Message-----
> > From: R-help <r-help-bounces using r-project.org> On Behalf Of George Brida
> > Sent: Wednesday, March 1, 2023 3:21 PM
> > To: r-help using r-project.org
> > Subject: [R] Shaded area
> >
> > Dear R users,
> >
> > I have an xlsx file (attached to this mail) that shows the values of a
> > "der" series observed on a daily basis from January 1, 2017 to January 25,
> > 2017. This series is strictly positive during two periods: from January 8,
> > 2017 to January 11, 2017 and from January 16, 2017 to January 20, 2017. I
> > would like to plot the series with two shaded areas corresponding to the
> > positivity of the series. Specifically, I would like to draw 4 vertical
> > lines intersecting the x-axis in the 4 dates mentioned above and shade the
> > two areas of positivity. Thanks for your help.
> > ______________________________________________
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>
> --
> John Kane
> Kingston ON Canada
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help using 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.