[R] example of geom_contour() with function argument

Big Floppy Dog bigfloppydog at gmail.com
Mon Oct 9 06:02:10 CEST 2017

```Can someone please point me to an example with geom_contour() that uses a
function? The help does not have an example of a function, and also  I did
not find anything from online searches.

TIA,
BFD

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Am So., 8. Okt. 2017, 20:52 schrieb Ranjan Maitra <maitra at email.com>:

> Hi,
>
> I am no expert on ggplot2 and I do not know the answer to your question. I
> looked around a bit but could not find an answer right away. But one
> possibility could be, if a direct approach is not possible, to draw
> ellipses corresponding to the confidence regions of the multivariate t
> density and use geom_polygon to draw this successively?
>
> I will wait for a couple of days to see if there is a better answer posted
> and then write some code, unless you get to it first.
>
> Thanks,
> Ranjan
>
>
> On Sun, 8 Oct 2017 09:30:30 -0500 Big Floppy Dog <bigfloppydog at gmail.com>
> wrote:
>
> > Note: I have posted this on SO also but while the question has been
> > upvoted, there has been no answer yet.
> >
> >
>
https://stackoverflow.com/questions/46622243/ggplot-plot-2d-probability-density-function-on-top-of-points-on-ggplot
> >
> > Apologies for those who have seen it there also but I thought that this
> > list of experts may have someone who knows the answer.
> >
> > I have the following example code:
> >
> >
> >
> > require(mvtnorm)
> > require(ggplot2)
> > set.seed(1234)
> > xx <- data.frame(rmvt(100, df = c(13, 13)))
> > ggplot(data = xx,  aes(x = X1, y= X2)) + geom_point() + geom_density2d()
> >
> >
> >
> > It yields a scatterplot of X2 against X1 and a KDE contour plot of the
> > density (as it should).
> >
> > My question is: is it possible to change the contour plot to display
> > the contours
> >
> > of a two-dimensional density function (say dmvt), using ggplot2?
> >
> > The remaining figures in my document are in ggplot2 and therefore I
> > am looking for a ggplot2 solution.
> >
> > Thanks in advance!
> >
> > BFD
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>

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