ggplot每组只包含一个观察

Question

我试图让类似这样的回答一个情节:/sf/answers/341455551/

我的数据框如下所示:

df2 <- read.table(text='measurements samples value
1        4hours   sham1     6
2          1day   sham1   175
3         3days   sham1   417
4         7days   sham1   163
5        14days   sham1    37
6        90days   sham1   134
7        4hours   sham2     8
8          1day   sham2   402
9         3days   sham2   482
10        7days   sham2    67
11       14days   sham2    16
12       90days   sham2    31
13       4hours   sham3   185
14         1day   sham3   402
15        3days   sham3   482
16        7days   sham3    85
17       14days   sham3    29
18       90days   sham3    10',header=T)

并绘制它

ggplot(df2, aes(measurements, value)) + geom_line(aes(colour = samples))

情节中没有显示任何线条,我收到了消息

geom_path: Each group consist of only one observation. 
Do you need to adjust the group aesthetic?

我不知道我在做什么与上面链接的答案有所不同.我应该改变什么来使这项工作？

Answer 1

添加group = samples到aes的geom_line.这是必要的,因为您需要每行samples而不是每个数据点一行.

ggplot(df2, aes(measurements, value)) + 
  geom_line(aes(colour = samples, group = samples))