Draw angled ellipses around clusters on PCA plot

조회 수: 18 (최근 30일)
Reed Trende
Reed Trende 2023년 11월 23일
답변: Matt J 2023년 11월 29일
I would like to draw angled ellipses around clusters in a PCA plot representing the 95% CI for this cluster, similar to what is done by autoplot in R (also, see attached example, or this link https://r-charts.com/correlation/scatter-plot-ellipses-ggplot2/). Any resources for how to do this in matlab, or the math behind how to do this would be much appreciated!
As a note: I did see a post on this forum where people drew ellipses in line with the axes where the height of the ellipse is the 95% CI in X and the width is the 95% CI in Y; this is NOT what I would like, I would like the ellipses at an angle that fits the shape of the clusters, as shown in my examples

채택된 답변

Mathieu NOE
Mathieu NOE 2023년 11월 24일

추가 답변 (2개)

Matt J
Matt J 2023년 11월 29일
편집: Matt J 2023년 11월 29일
See also elliipticalFit from the FEX downloadable,
It can also be used to plot ellipses as well as fit them, e.g.,
[Center,Axes,Angle]=deal([0 2] , [2 1], 30); %Ellipse parameters
plot( ellipticalFit.groundtruth([],Center,Axes,Angle) );

Matt J
Matt J 2023년 11월 29일
Using polyshapes:
ellipse=rotate( scale(nsidedpoly(1000),[2,1]) ,30);


Help CenterFile Exchange에서 Dimensionality Reduction and Feature Extraction에 대해 자세히 알아보기




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by