着色图由R因子 [英] Colouring plot by factor in R

问题描述

我正在绘制两个变量的散点图，并希望通过因子变量为点着色。以下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)

这很好，但是我怎么知道因子已经上色什么颜色？

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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