如何在ggplot2中包裝一個也有數學符號的軸標題？-有解無憂

我的 y 軸的標題很長，并在其末尾包含數學符號。理想情況下，標題將占據 2 行，頂部顯示“長標題示例”，底部顯示“使用數學運算 (% yr-1)”。如何包裝 y 軸標題？

我已經看到了這個SO question，但是當標題中有數學符號時，我似乎無法讓它作業。

帶有包含數學符號的長標題的示例圖

library(ggplot2)

ggplot(data = iris, aes(x = Sepal.Length, y = Sepal.Width))  
  geom_point(shape = 21, size = 4, aes(fill = factor(Species)))  
  stat_smooth(method = 'lm', se = F, color = "red")  
  ylab(expression(Long~Title~Example~with~Mathematical~Operation~("%"~yr^-1)))  
  xlab("Species")  
  labs(fill = "Species")  
  scale_y_continuous(breaks = seq(0,5,1), limits = c(0,5))  
  scale_x_continuous(breaks = seq(0,8,1), limits = c(0,8))  
  theme_bw()  
  theme(panel.grid = element_blank(),
        text = element_text(size = 18, color = "black"),
        axis.text.x = element_text(size = 18, color = "black"),
        axis.text.y = element_text(size = 18, color = 'black'),
        legend.title.align = 0.5,
        legend.position = c(0.15,0.2))

uj5u.com熱心網友回復：

這是一個潛在的解決方案：

library(ggplot2)

# x axis split over two lines
ggplot(data = iris, aes(x = Sepal.Length, y = Sepal.Width))  
  geom_point(shape = 21, size = 4, aes(fill = factor(Species)))  
  stat_smooth(method = 'lm', se = F, color = "red")  
  ylab(expression(atop(Long~Title~Example,
                       with~Mathematical~Operation~("%"~yr^"-1"))))  
  xlab("Species")  
  labs(fill = "Species")  
  scale_y_continuous(breaks = seq(0,5,1), limits = c(0,5))  
  scale_x_continuous(breaks = seq(0,8,1), limits = c(0,8))  
  theme_bw()  
  theme(panel.grid = element_blank(),
        text = element_text(size = 18, color = "black"),
        axis.text.x = element_text(size = 18, color = "black"),
        axis.text.y = element_text(size = 18, color = 'black'),
        legend.title.align = 0.5,
        legend.position = c(0.15,0.2))
#> `geom_smooth()` using formula 'y ~ x'

如何在ggplot2中包裝一個也有數學符號的軸標題？

^{由reprex 包于 2022-03-14 創建(v2.0.1)}

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標籤：r ggplot2

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