ggvis 中的特殊符号 [英] Special symbols in ggvis

问题描述

我正在绘制一个相当典型的地球化学剖面图，我需要在 x 轴上使用下标和希腊符号

I'm making a fairly typical plot of geochemistry profiles for which I need to use a subscript and a greek symbol in the x-axis

它应该是 CH4 (umol)，其中 4 是下标，而 u 是希腊符号 mu

It should read CH4 (umol) where the 4 is subscript and the u is the greek symbol mu

ggvis 代码:

ch4 %>% ggvis(~ch4_umol, ~depth_cm, fill=~Core, stroke=~Core) %>% 
  layer_lines(fillOpacity=0) %>% scale_numeric('y', reverse=T) %>% 
  add_axis("y", title = "Depth (cm)") %>%
  add_axis('x', orient='top', title="CH[4] ("mu "mol)") 

旁注:我知道我可以在 ggplot2 中制作正确的标签，但我不能将 x 轴放在 ggplot2 的顶部

Side-note: I know that I can make the proper labels in ggplot2 but I can't put the x-axis on top in ggplot2

推荐答案

library(ggvis)

title <- "CH\u2084 (\u03BC mol)"

mtcars %>%
  ggvis(~wt, ~mpg) %>%
  layer_points() %>% 
  add_axis('x', orient = 'top', title = title) 

如果您将来需要更多特殊字符，请查找它们在这里并寻找C/C++/Java源代码".

In case you need more special characters in the future, look them up here and look for "C/C++/Java source code".

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