[Matplotlib-devel] plot confidence ellipse

[Antony Lee]

Dear Carsten,

Thank you for sharing your example.
I personally think it looks like a reasonably common task, but Matplotlib
is trying to move away from doing the statistical computations in favor of
concentrating on the just providing the plotting parts (at least that's my
personal take).  Hence, the example may be a better addition to the
Matplotlib gallery (under examples/ in the source tree); feel free to open
a PR for that.

Cheers,

Antony

On Thu, Feb 21, 2019 at 9:40 PM Carsten Schelp <CSchelp at gmx.net> wrote:

> Hello,
>
> Quite some time ago I had to plot confidence ellipses for two-dimensional
> datasets.
> There was no out-of-the-box solution in the libraries I used, then.
> Also, all the solutions that I found when searching online seemed
> cumbersome or did not even work well.
>
> So I brewed my own. You can see the result of my effort in this blogpost
> here (python, using numpy and matplotlib):
> https://carstenschelp.github.io/2018/09/14/Plot_Confidence_Ellipse_001.html
> - along with an explanation how and why it works.
>
> If you guys think that this functionality might be useful within
> matplotlib, I would happily prepare this approach - pythonic-checks, tests
> and all - and send a patch or pull request.
> I consider the confidence ellipse a kind of "cousin" to the "scatter(...)"
> function. Maybe it is appropriate to place it next to "scatter" - but that
> is still to be discussed, I think.
> Do you think that a function to plot the confidence ellipse of a
> two-dimensional dataset should be part of matplotlib?
> I am curious to hear your opinion. If the answer is "yes" I will make time
> to get the existing code "matplotlib-ready".
>
> (Sorry, I am posting this for the second time. First time, I sent an html
> message which messed up the readability in the list)
> Kind regards, Carsten
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