[R] How can I add text in plot and x axis of figures created in ggplot2?

[Ulrik Stervbo]

Hi Marna,

when you use facet there is just one X-axis title and one Y-axis title. As
an alternative you can create several plots and put them into one using the
package gridExtra.

As for adding text you can use geom_text and extract the x, y coordinates
from your data. When I add text, I usually create a separate data.frame
which in addition to the text I want to add and the positions also contains
indications of the global aesthetic and the facet column

Hope this helps
Ulrik

On Thu, 1 Sep 2016 at 15:48 John Kane <jrkrideau at inbox.com> wrote:

> Hi Marna,
>
> Thanks for providing the data and code. However there is a problem with
> the code and I wondered if something got garbled in transmission.
>
> Below is the code that was in my mailbox
> ==================================================
> ylab <http://docs.ggplot2.org/0.9.2.1/labs.html>*(*"My Y"*)+*theme(
> axis.text.x = element_text(size=8))
> =================================================
> Clearly not functioning code
>
> Am I correct in assuming that what it originally looked like was :
> ==============================================
> ylab("http://docs.ggplot2.org/0.9.2.1/labs.html") +
>        theme(axis.text.x = element_text(size=8))
> ==============================================
> ?
>
> It looks like you are sending mail in HTML and that can badly mangle code
> and data layouts. Please send an messages to R-help in plain text.
>
> I don't use facet_wrap() enough to know if what you want to do is doable
> but I am a bit dubious.
>
> I wonder if you have considered creating 4 independent graphs and using
> grid.Extra or grid.arrange to get the results you want.?
>
> Sorry not to be of more help
>
> John Kane
> Kingston ON Canada
>
>
> > -----Original Message-----
> > From: marna.wagley at gmail.com
> > Sent: Wed, 31 Aug 2016 16:35:29 -0700
> > To: r-help at r-project.org
> > Subject: [R] How can I add text in plot and x axis of figures created in
> > ggplot2?
> >
> > Hi R users,
> > I have created four figures using ggplot2, but I am having trouble  to
> > add
> > "r2=XXX, p=XX" value on the upper left in each figure and also unit of X
> > axis of each figure are different. I was also trying to write following
> > :
> > 1.  "rainfall (mm/year") on X axix for fig A.
> > 2. "temp (degree Celsius)" on X axis for fig B
> > 3.  "distance (m)" on X axis for fig C
> > 4.  "survival Proba(%) on X axis for fig D
> >
> > I am wondering how I can create the figures with the above information
> >
> > Thank you for your help in advance
> >
> > Sincerely,
> >
> > Marna
> >
> > following code and the example I have used.
> >
> > dat<-structure(list(x = c(0.31, 0.04, 0.1, 0.54, 0.03, 0.86, 0.97,
> >
> > 0.4, 0.62, 0.3, 0.44, 0.51, 0.03, 0.12, 0.79, 0.3, 0.22, 0.66,
> >
> > 0.75, 0.45), y = c(0.38, 0.61, 0.16, 0.06, 0.42, 0.67, 0.85,
> >
> > 0.11, 0.79, 0.21, 0.84, 0.95, 0.3, 0.47, 0.79, 0.2, 0.34, 0.21,
> >
> > 0.62, 0.25), group = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 2L,
> >
> > 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 4L, 4L, 4L, 4L, 4L), .Label = c("A",
> >
> > "B", "C", "D"), class = "factor")), .Names = c("x", "y", "group"
> >
> > ), class = "data.frame", row.names = c(NA, -20L))
> >
> >
> > gp<-ggplot(data=dat, aes(x=x, y=y))
> >
> > Gp<-gp + geom_point(size=1, col="blue")
> >
> > Gp<-Gp+ stat_smooth(method="lm", level=0.99,
> > col="black",formula=y~poly(x,1
> > ))+
> >
> > coord_cartesian(ylim=c(0, 1))+theme_bw()+
> >
> > theme(axis.text.y = element_text(angle = 90, vjust = 0))+
> >
> > ylab <http://docs.ggplot2.org/0.9.2.1/labs.html>*(*"My Y"*)+*theme(
> > axis.text.x = element_text(size=8))
> >
> > Gp+ facet_wrap(~group,ncol=5, scales="free_x")
> >
> >       [[alternative HTML version deleted]]
> >
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