ggplot:如何绘制二维散点图的轮廓线以概述数据点 [英] ggplot: How to draw contour line for 2d scatter plot to outline the data points

问题描述

我需要在x-y空间内绘制的所有数据点周围画一条线.我不需要二维密度分布.参见所附图片(该字段是手动绘制的).谢谢你.在数据点周围有线的散点图

I need to draw a line around all of my data points that plot within x-y space. I do not need 2d density distribution. See the picture attached (the field was just drawn manually). Thank you. scatter plot with line around data points

推荐答案

这是 ggalt 的 geom_encircle 的完美用例:

#install.packages('ggalt')
library(ggalt)
#> Loading required package: ggplot2

ggplot(iris, aes(Sepal.Length, Sepal.Width)) +
  geom_point() +
  geom_encircle()

您也可以按组包围:

ggplot(iris, aes(Sepal.Length, Sepal.Width, color = Species)) +
  geom_point() +
  geom_encircle()

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