# [R] How to rotate only one panel by 90 degrees in R plot?

Paul Murrell p@u| @end|ng |rom @t@t@@uck|@nd@@c@nz
Wed Oct 13 01:29:31 CEST 2021

```Hi

I don't think you need (or want) the 'gridGraphics' package for this.
You just need to flip the x-/y-data that you get from density() (and
make sure that you align the y-axes of the two plots).
The following code shows an example (and adds a bit of par() control to
eliminate white space).

layout(matrix(c(1,2),nrow=1), widths=c(3,1))
par(mar=c(5, 4, 2, 1))
plot(negative_x, negative_y, ylim=c(0,0.5), xlim=c(0,41), cex=1.5,
xlab=expression(bold("X")),
ylab=expression(bold("Y")))
points(positive_x, positive_y, pch=16, cex=1.5)
points(uncertain_x, uncertain_y, pch=16, cex=1.5, col="grey")
legend("topleft",
legend = c("Positives", "Negatives", "Uncertains"),
pch = c(16, 1, 16), col=c("black", "black", "grey"), cex=0.8)
# plot density
d <- density(c(negative_y, uncertain_y, positive_y))
par(mar=c(5, 1, 2, 1))
plot(d\$y, d\$x, ylim=c(0,0.5), type="l",
yaxt="n", xaxt="n", main=NA, ylab=NA, xlab=NA)

Does that produce the sort of thing you want?

Paul

On 13/10/2021 9:42 am, Luigi Marongiu wrote:
> Hello,
> I would like to show a density plot of the Y axis. To do that, I would
> like to split the plot into a panel 2/3 long and a density plot 1/3
> long. The problem is that, since the density is on the Y axis, the
> density plot should be rotated byb90 degrees. I tried with the package
> gridGraphics but it rotates both panels.
> ```
> negative_y <- runif(50, 0, 0.099)
> negative_x <- runif(50, 1, 40)
> positive_y <- c(runif(30, 0.2, 0.5), runif(20, 0.4, 0.5))
> positive_x <- c(runif(30, 25, 40), runif(20, 10, 25))
> uncertain_y <- runif(10, 0.099, 0.2)
> uncertain_x <- runif(10, 2, 40)
> # plot on MR/FCN space
> layout(matrix(c(1,2),nrow=1), widths=c(3,1)) # split panels unevenly
> plot(negative_x, negative_y, ylim=c(0,0.5), xlim=c(0,41), cex=1.5,
> xlab=expression(bold("X")),
> ylab=expression(bold("Y")))
> points(positive_x, positive_y, pch=16, cex=1.5)
> points(uncertain_x, uncertain_y, pch=16, cex=1.5, col="grey")
> legend("topleft",
> legend = c("Positives", "Negatives", "Uncertains"),
> pch = c(16, 1, 16), col=c("black", "black", "grey"), cex=0.8)
> # plot density
> plot(density(c(negative_y, uncertain_y, positive_y)),
> yaxt="n", xaxt="n", main=NA, ylab=NA, xlab=NA)
> library(gridGraphics)
> grab_grob <- function(){
> grid.echo()
> grid.grab()
> }
> g <- grab_grob()
> grid.newpage()
> pushViewport(viewport(width=0.7,angle=270))
> grid.draw(g)
> ```
> How can I rotate only the second panel? I tried to assign the second
> plot to an object p and then call grid.draw(p), or to assign g to the
> second plot, but they did not work...
> Thanks
>
>
> --
> Best regards,
> Luigi
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> <https://stat.ethz.ch/mailman/listinfo/r-help>
> http://www.R-project.org/posting-guide.html
> <http://www.R-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.

--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul using stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/

```