[R] problem with plotting clustered data with convex hull using ggfortify

Bert Gunter
Sun, 24 Oct 2021 21:19:48 -0000

ggfortify is a (nonstandard) contributed package. Please note that per the
posting guide linked below:

"For questions about functions in standard packages distributed with R (see
the FAQ Add-on packages in R
<https://cran.r-project.org/doc/FAQ/R-FAQ.html#Add-on-packages-in-R>), ask
questions on R-help.
If the question relates to a *contributed package* , e.g., one downloaded
from CRAN, try contacting the package maintainer first. You can also use
find("functionname") and packageDescription("packagename")
to find this
information. *Only* send such questions to R-help or R-devel if you get no
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So while you may get help here, the above may be a better course of action.
Also, if all you have done is copy and paste code, you should consider
going through the vignettes for the package. They seem fairly extensive
from my quick look and may well provide the answers you seek.

Bert Gunter



On Sun, Oct 24, 2021 at 1:57 PM Karl Schilling <karl.schilling at
uni-bonn.de>
wrote:

> Dear all:
>
> I have some data that I want to cluster and display as groups surrounded
> by convex hulls. Here, i use the iris data as an example:
>
> library(ggfortify)
> autoplot(fanny(iris[-5], 3), frame = TRUE)
>
> I used this code before, about a year ago, and then it resulted in data
> surrounded by convex hulls., just as may be seen in the description of
> ggfortify here:
>
>
>
>
http://rstudio-pubs-static.s3.amazonaws.com/53162_cd16ee63c24747459ccd180f69f07810.html
>
>
> Presently, no hulls are drawn; instead some line is projected on each
> cluster.
>
> I found out that there is an addition to autoplot command, "frame.type
> c("convex", "norm", "t"). Whereas
""norm" and "t"  give confidence
> ellipses as expected, "convex" results in a straight line as
mentioned
> above.
>
> Any help would be appreciated.
>
> Best
>
> --
> Karl Schilling
>
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