我如何添加另一个图层/新系列到ggplot？ [英] How can I add another layer / new series to a ggplot?

问题描述

在ggplot中，我可以添加一个系列图：

  ggplot（diamonds，aes（x = carat，y = price））+ geom_point（）
  

如何简单地添加另一个系列，例如绘制红宝石对钻石的成本。假设红宝石也在钻石数据集中。我曾尝试将红宝石数据放在最上面的一层，但它只是绘制红宝石，而不是钻石/克拉。

  ggplot（钻石，aes（x =克拉，y =价格））+ geom_point（）+ aes（x =红宝石，y =价格）
  

我可以看到，首先将所有数据融合在一起，随时准备绘制它，所以也许我应该沿着这条路线走下去。然而，仅仅为这样的情节添加另一个系列似乎不应该太难，但我不知道该怎么做。

解决方案

  rubies < -  data.frame（carat = c（3,4,5），price = c（5000,5000,5000））
 
 ggplot（钻石，aes（克拉，价格））+ 
 geom_point（）+ 
 geom_point（data = rubies，color =red）
  

In ggplot I can add a series to a plot with:

ggplot(diamonds, aes(x = carat, y = price)) + geom_point()

How do I simply add another series, e.g. plotting the cost of rubies against diamonds. Assuming rubies was also in the diamonds dataset. I have tried to lay over the top another layer with the rubies data, but it just plots the rubies and not the diamonds/carat.

ggplot(diamonds, aes(x = carat, y = price)) + geom_point() + aes(x = rubies, y = price)

I can see that this would be possible by melding all the data together first, ready to plot it, so maybe I should go down that route. However, just adding another series to a plot like this seems like it should not be too hard, but I can't figure out how to do it.

解决方案

rubies  <- data.frame(carat = c(3, 4, 5), price= c(5000, 5000, 5000))

ggplot(diamonds, aes(carat, price)) + 
  geom_point() + 
  geom_point(data = rubies, colour = "red")

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