R 绘制散点图并根据ggplot2中的一个分类列设置颜色

给出如下数据帧：

structure(list(city = structure(c(1L, 3L, 4L, 2L), .Label = c("bj", 
"cq", "sh", "tj"), class = "factor"), area = c(1580.86, 1927.95, 
532.24, 613.09), price = c(9.51, 94.42, 10.77, 8.58), level = structure(c(1L, 
1L, 2L, 2L), .Label = c("a", "b"), class = "factor")), class = "data.frame", row.names = c(NA, 
-4L))

我想画一个散点图，其中

x

表示

area

和

y

表示

price

，同时，点的颜色仅基于

level

，这意味着只有两种颜色可以区分

a

和

b

---

如何使用

ggplot2

绘制此图？谢谢。

您可以使用以下代码来实现此目的

library(ggplot2) 
ggplot(df, aes(x = area, y = price, col=level)) + geom_point()

数据

df=structure(list(city = structure(c(1L, 3L, 4L, 2L), .Label = c("bj", 
"cq", "sh", "tj"), class = "factor"), area = c(1580.86, 1927.95, 
532.24, 613.09), price = c(9.51, 94.42, 10.77, 8.58), level = structure(c(1L, 
1L, 2L, 2L), .Label = c("a", "b"), class = "factor")), class = "data.frame", row.names = c(NA, 
-4L))

---

如果我想将

city

添加到点，我使用了

geom_text（aes（label=city））

，它似乎不起作用。我认为最好使用

geom_text\u repel

。是的，修改了答案以供将来参考。

df=structure(list(city = structure(c(1L, 3L, 4L, 2L), .Label = c("bj", 
"cq", "sh", "tj"), class = "factor"), area = c(1580.86, 1927.95, 
532.24, 613.09), price = c(9.51, 94.42, 10.77, 8.58), level = structure(c(1L, 
1L, 2L, 2L), .Label = c("a", "b"), class = "factor")), class = "data.frame", row.names = c(NA, 
-4L))