[R] example of geom_contour() with function argument

Big Floppy Dog
2017-10-09T13:03:33Z

Hello Ulrik,

I apologize, but I can not see how to provide a pdf in place of the density
function which calculates a KDE (that is, something from the dataset in the
example). Can you please point to the specific example that might help?

Here is what I get:

require(mvtnorm)
require(ggplot2)
set.seed(1234)
xx <- data.frame(rmvt(100, df = c(13, 13)))


v <- ggplot(faithfuld, aes(waiting, eruptions, z = drmvt, df = c(13,13)))
v + geom_contour()

Don't know how to automatically pick scale for object of type function.
Defaulting to continuous.
Error: Aesthetics must be either length 1 or the same as the data (5625):
x, y, z, df


Can you please tell me how to use this here? Or is some other example more
appropriate?

TIA,
BFD



On Mon, Oct 9, 2017 at 2:22 AM, Ulrik Stervbo <ulrik.stervbo at gmail.com>
wrote:

> Hi BFD,
>
> ?geom_contour() *does* have helpful examples. Your Google-foo is weak:
> Searching for geom_contour brought me: http://ggplot2.tidyverse.
> org/reference/geom_contour.html as the first result.
>
> HTH
> Ulrik
>
> On Mon, 9 Oct 2017 at 08:04 Big Floppy Dog <bigfloppydog at
gmail.com> wrote:
>
>> 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
>>
>>
>> ------------------------------------------------------------
>> -----------------------------------
>>
>> How about geom_contour()?
>>
>> 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]]
>> > >
>> > > ______________________________________________
>> > > R-help at 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.
>> > >
>> >
>> >
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at 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.
>>
>

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