生成的軸刻度標簽中的斜體字母-有解無憂

我在創建結合斜體字母和變數輸入的軸刻度標簽時遇到問題。簡單的說，我想呼叫變數，在每個標簽下面插入n =1等文字。

這是一個示例，除了斜體n 之外的所有內容：

require(ggplot2)

mpg$class <- as.factor(mpg$class)
counts <- rep(1:7, 1)

ggplot(mpg, aes(class, hwy))  
  geom_boxplot()  
  scale_x_discrete(labels = paste(levels(mpg$class), "\nn = ", counts, sep = ""))

生成的軸刻度標簽中的斜體字母

我的第一個想法是將 Unicode 用于斜體 N，就像我過去對上標數字所做的那樣。但是由于某種原因，這封信太小了，而且在風格上與文本的其余部分不匹配。更重要的是，在我的實際用例中，斜體 n 的所有 Unicode 字符似乎都呈現不對齊，在正常和下標之間的某個地方被壓低。

ggplot(mpg, aes(class, hwy))  
  geom_boxplot()  
  scale_x_discrete(labels = paste(levels(mpg$class), "\n\U1D45B = ", counts, sep = ""))

生成的軸刻度標簽中的斜體字母

So, I found the plotmath function ~italic(x) could be used to italicize letters. However, there's a clear and unexpected failure when I incorporate it in the paste() line for the x-axis tick labels. Note that the function does work in xlab()

ggplot(mpg, aes(class, hwy))  
  geom_boxplot()   xlab(~italic("n"))  
  scale_x_discrete(labels = paste(levels(mpg$class), "\n", ~italic("n"), " = ", counts, sep = ""))

生成的軸刻度標簽中的斜體字母

I have searched StackOverflow for similar cases. However, none of them need to call for variables:

Add greek letters to axis tick labels in R

Changing one character in axis tick labels to italic while keeping multiple lines

How to change into italic style one letter in R plot without adding a space

How to italicize part (one or two words) of an axis title

I have tried understanding how to use expression() and bquote() while being able to call variables, but I have been unable to produce anything functional.

At this point, any help is very appreciated!

uj5u.com熱心網友回復：

這些天，您可以使用 ggtext 包通過一些 markdown/html 裝飾來設定文本樣式。

library(ggplot2)
library(ggtext)
#> Warning: package 'ggtext' was built under R version 4.1.1

mpg$class <- as.factor(mpg$class)
counts <- rep(1:7, 1)

ggplot(mpg, aes(class, hwy))  
  geom_boxplot()  
  scale_x_discrete(
    labels = paste0(levels(mpg$class), "<br><i>n = ", counts, "</i>")
  )  
  theme(axis.text.x = element_markdown())

生成的軸刻度標簽中的斜體字母

^{由reprex 包( v2.0.0 )于 2021 年 10 月 16 日創建}

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標籤：r ggplot2 plotmath italic

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