我试图使用scale_x_discrete来适应带斜体n和换行符的标题。这里有一个使用mpg的示例。如果不尝试获取斜体,则制造商名称将出现在标记下方居中,n =行将居中于其下方。这正是我想要的。我无法通过bquote或expression产生斜体来重现它。由于斜体n是标题中最常见的符号之一,我认为我正在忽略某些明显的东西。请问有人能帮忙吗?
mpg2<- subset(mpg, manufacturer %in% c("audi", "toyota"))
mpg3<- subset(mpg2, class %in% c("compact", "midsize"))
cbp <- c("#E69F00", "#56B4E9")
xsub1 <-bquote(paste("Audi\n", italic("n"), " = 18 (15, 3)"))
xsub2 <-bquote(paste("Toyota\n", italic("n"), " = 19 (12, 7)"))
ggplot (mpg3, aes (x=manufacturer, y=hwy, colour=class))+
geom_boxplot()+
labs (colour = NULL)+
xlab("")+
ylab("highway mpg")+
scale_colour_manual (labels = c ("compact","midsize"),
values = c(cbp))+
scale_x_discrete(labels=c(xsub1, xsub2)) +
theme (legend.position = "bottom")