ggplot2 - x 轴上的上标刻度文本

我试图让 x 轴上两个变量的文本具有上标。我希望“+”成为上标，但无论我尝试什么，它最终都会显示整个代码。我尝试为它制作单独的标签，并尝试使其更简单

test.labs=as_labeller(c('CD4Gated' = 'CD4^+ cells', 'CD8Gated' = 'CD8^+ cells', 'Bcell' 
= "B cells"), default = label_parsed)

bFICOLL + scale_x_discrete(labels=c(CD4Gated = "CD4^+ cells", CD8Gated = "CD8^+ cells", 
Bcell = "B cells"))

在另一张图中（经过大量搜索！）我设法让标题包含上标和下面的代码，但它不适用于刻度标签。

ggtitle('Spring FEC &' ~~ CD4^'+' ~~ 'cells')

这是该图的代码。希望有人能够告诉我我做错了什么？

  bFICOLL <-  ggplot(LymphOrder, aes(x=WBC, y=Percentage, fill=Diagnosis, 
  shape=Diagnosis)) + 
  geom_violin() +
  facet_wrap(~Season, scale="free")+
  theme(strip.text.x = element_text(size = 30))+
  geom_point(pch = 21, position = position_jitterdodge())+
  scale_fill_manual(values=c("#56B4E9", "#009E73"))+ 
  scale_shape_manual(values=c(1,2))+
  theme(panel.background = element_blank(), axis.line = element_line(colour = "black"))+
  theme(strip.background = element_rect( color="black", fill="#FFFFFF", size=1.5, 
  linetype="solid"))+
  ggtitle('Lymphocyte subsets')+
  theme(plot.title = element_text(size = 40, face = "bold")) +
  ylab('Percentage') +
  xlab("Lymphocytes")+
  ylim(0,80)+
  theme(axis.ticks.length = unit(5, "pt"))+
  theme(axis.title.x = element_text(size=20))+
  theme(axis.text.x = element_text(size=15))+
  theme(axis.text.x = element_text(angle = 30, hjust = 1))+
  theme(axis.text.y = element_text(size=20))+
  theme(axis.title.y = element_text(size=20))+
  theme(legend.title = element_blank(),
    legend.text = element_text(size = 20))
  bFICOLL + scale_x_discrete(labels=c(CD4Gated = "CD4^+ cells", CD8Gated = "CD8^+ 
  cells", 
  Bcell = "B cells"))

Boxplot without superscript in x axis tick labels

使用ggtext包裹：

library(ggplot2)
library(ggtext)

my_labs <- c(setosa = "CD4^+ cells", versicolor = "CD8^+ 
  cells", virginica = "B cells")

ggplot(iris, aes(Species, Sepal.Length)) + 
  geom_boxplot() +
  scale_x_discrete(labels = my_labs) +
  theme(axis.text.x = element_markdown())

^{Created on 2022-06-14 by the reprex package https://reprex.tidyverse.org (v2.0.1)}