使用ggplot函数将geom_path添加到boxplot时出错 [英] error with adding geom_path to boxplot using ggplot function

问题描述

我打算创建一个箱形图，并突出显示成对比较的显着性水平. 以前的帖子中对此进行了处理.

I intend to create a boxplot and highlight the significance level of pairwise comparisons. This has been dealt in a previous post.

当我对数据集执行相同操作时，出现以下错误:

When I do the same for my data-set, I get the following error:

 "Incompatible lengths for set aesthetics: x, y"

这是一个说明问题的示例数据集-

Here's an example data-set to illustrate the problem -

data1<-data.frame(island = c("A", "B", "B", "A", "A"), count = c(2, 5, 12, 2, 3))
g1<-ggplot(data1) +  geom_boxplot(aes(x = factor(island), y = count)) 
g1 + geom_path(x = c(1, 1, 2, 2), y = c(25, 26, 26, 25))  

在运行代码的第三行时出现错误，而箱线图结果还不错.我怀疑我错过了一些非常琐碎的东西，但是我无法抓住它.非常感谢您的帮助.

I get the error while running the third line of the code, while the boxplot turns out alright. I suspect I'm missing out on something very trivial, but I'm unable to catch it. I'd greatly appreciate any help.

推荐答案

由于geom_path中没有显式的data自变量，因此将ggplot中data自变量中的数据继承"为geom_path.然后，当发现"data1"中x和y变量的长度与geom_path调用中x和y向量的长度不同时，该机制就会感到窒息.尝试为geom_path创建一个单独的数据框，并使用data参数:

Because you don't have an explicit data argument in geom_path, data from the data argument in ggplot is 'inherited' to geom_path. The machinery then chokes when it finds out that the length of the x and y variables in 'data1' differs from the length of the x and y vectors in the geom_path call. Try to create a separate data frame for geom_path and use the data argument:

data2 <- data.frame(x = c(1, 1, 2, 2), y = c(25, 26, 26, 25))

ggplot(data = data1, aes(x = factor(island), y = count)) +
  geom_boxplot() +
  geom_path(data = data2, aes(x = x, y = y))

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