ggplot2:如何用geom_jitter和geom_point控制点颜色? [英] ggplot2: How do you control point color with geom_jitter and geom_point?

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问题描述

这与此处。然而,我并没有试图制作 boxplot ,而是ggplot2中的 scatterplot ,但添加了参数 geom_jitter()添加黑点,这似乎与我的数据集无关。



以下是使用mpg数据包的示例:



这是一个<
$ b

  gmpg <-ggplot(data = mpg, aes(x = hwy,y = cty))
gmpg + geom_point(aes(col = manufacturer))

产生这种结果:
$ b $ p现在,如果我添加抖动参数,这就是发生了什么

  gmpg + geom_point(aes(col = manufacturer))+ geom_jitter()



我试过减少alpha等。,但黑点仍然存在。这些东西到底是什么?如何去除它们?

解决方案

不需要在 geom _ * 功能。这应该有效:

  gmpg < -  ggplot(data = mpg,aes(x = hwy,y = cty,col = )
gmpg + geom_point()+ geom_jitter()


This is related to the question here. However, I'm not trying to make a boxplot, but a scatterplot in ggplot2, but adding the argument geom_jitter() adds black dots which seem to be non-related to my dataset.

Here's an example using the mpg data pack:

This is a simple scatterplot, that looks a bit "too clean"

gmpg<-ggplot(data=mpg, aes(x=hwy, y=cty))
gmpg+geom_point(aes(col=manufacturer))

Which produces this:

Now, if I add the argument jitter, this is what happens

gmpg+geom_point(aes(col=manufacturer))+geom_jitter()

I've tried reducing the alpha etc., but the black dots remain. What on earth are these and how do I remove them?

解决方案

There is no need to assign a new aesthetic mapping in the geom_* functions. This should work:

gmpg <- ggplot(data=mpg, aes(x=hwy, y=cty, col=manufacturer))
gmpg + geom_point() + geom_jitter()

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