ggplot在x轴上显示表达式 [英] ggplot displaying expression in x axis
本文介绍了ggplot在x轴上显示表达式的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
下面,我有R代码来绘制成组的条形图.
Below, I have R code that plots a grouped bar plot.
group_name = c('A_1x', 'A_1x', 'A_2x', 'A_2x', 'A_3x', 'A_3x', 'A_4x', 'A_4x')
mydata2 <- data.frame(mygroup = group_name,
mysubgroup = factor(c("Yes", "No"),
levels = c("Yes", "No")),
value = c(60,40,90,10,55,45,88,12))
ggplot(mydata2, aes(mygroup, value, fill = mysubgroup)) +
geom_bar(position = "dodge", width = 0.5, stat = "identity")+
coord_flip()
当前,该图如下所示.但是,我想在x轴上显示表达式,如下图所示.
Currently, the plot looks like below. However, I want to show expressions in the x axis as shown in the below picture.
我已经尝试过:
group_name = c(expression(A[1*x]),expression(A[1*x]),
expression(A[2*x]),expression(A[2*x]),
expression(A[3*x]),expression(A[3*x]),
expression(A[4*x]),expression(A[4*x]))
但是它给出了以下错误:
But it gives the following error:
Error in as.data.frame.default(x[[i]], optional = TRUE) :
cannot coerce class ""expression"" to a data.frame
如何解决?
推荐答案
这里是一个有效的示例-我将 group_name
更改为4个元素,而不是8个,并将它们手动添加到了 ggplot中
表达式.问题是表达式类型不能是 data.frame
的列名.这样可以解决这个问题.
Here is a working example - I changed the group_name
to 4 elements instead of 8 and manually added them into the ggplot
expression. The issue was that the expression type can't be a column name for a data.frame
. This escapes that issue.
library(ggplot2)
group_name = c('A_1x', 'A_1x', 'A_2x', 'A_2x', 'A_3x', 'A_3x', 'A_4x', 'A_4x')
mydata2 <- data.frame(mygroup = group_name,
mysubgroup = factor(c("Yes", "No"),
levels = c("Yes", "No")),
value = c(60,40,90,10,55,45,88,12))
group_name = c(expression(A[1*x]),
expression(A[2*x]),
expression(A[3*x]),
expression(A[4*x]))
ggplot(mydata2, aes(mygroup, value, fill = mysubgroup)) +
geom_bar(position = "dodge", width = 0.5, stat = "identity")+
coord_flip() +
scale_x_discrete(labels=group_name) # Adding the labels here
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