按 R 中的因子着色图 [英] Colouring plot by factor in R

问题描述

我正在制作两个变量的散点图，并希望通过因子变量为点着色.这是一些可重现的代码:

I am making a scatter plot of two variables and would like to colour the points by a factor variable. Here is some reproducible code:

data <- iris
plot(data$Sepal.Length, data$Sepal.Width, col=data$Species)

这一切都很好，但我怎么知道什么因素被染上了什么颜色??

This is all well and good but how do I know what factor has been coloured what colour??

推荐答案

data<-iris
plot(data$Sepal.Length, data$Sepal.Width, col=data$Species)
legend(7,4.3,unique(data$Species),col=1:length(data$Species),pch=1)

应该为你做.但我更喜欢 ggplot2 并建议在 R 中获得更好的图形.

should do it for you. But I prefer ggplot2 and would suggest that for better graphics in R.

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