在R的ggplot文本中添加箭头符号 [英] Adding arrow symbols in ggplot text in R

问题描述

我最近发现，可以在ggplot的带注释的文本内添加希腊字母和其他符号。我正在尝试在文本中添加箭头（向上和向下），但似乎找不到正确的数字代码。我尝试搜索，但无法在线找到代码列表。语法类似于标签下的语法：

  label ='test text'* symbol（'\\205' ） 
  

\142为beta符号，\154为伽玛符号。有谁知道此代码如何工作？谢谢！

解决方案

以下作品：

  ggplot（mpg，aes（displ，hwy））+ 
 geom_point（）+ 
 geom_smooth（aes（colour = loess），method = loess，se = FALSE） + 
 geom_smooth（aes（colour = lm），method = lm，se = FALSE）+ 
 labs（colour = Method）+ 
 annotate（ text， x = 3.5，y = 35，label = sprintf（'\u2191'））+ 
 geom_curve（aes（x = 4，y = 30，xend = 3.5，yend = 34），
颜色=＃FF0000，
大小= 0.5，
曲率= -0.2，
箭头=箭头（长度=单位（0.03， npc）））+ 
 geom_label（ aes（x = 4，y = 31，label =这是nUnicode符号），
 hjust = 0，
 vjust = 0.5，
 color =＃FAAB18， 
 fill = white，
 label.size = NA，
 family = Helvetica，
 size = 6）
  

Unicode箭头f rom

I recently found out that it is possible to add greek alphabets and other symbols within the annotate text in ggplot. I am trying to add arrows (upwards and downwards) to my text and I can't seem to find the correct numerical code for it. I tried searching but can't find a list of codes online. The syntax is something like that under label:

label="'test text ' * symbol('\\205')"

\142 gives a beta symbol and \154 gives a gamma symbol. Anyone knows how does this code works? Thanks!

解决方案

The following works:

ggplot(mpg, aes(displ, hwy)) +
  geom_point() +
  geom_smooth(aes(colour = "loess"), method = "loess", se = FALSE) +
  geom_smooth(aes(colour = "lm"), method = "lm", se = FALSE) +
  labs(colour = "Method") +
  annotate("text", x = 3.5, y = 35, label = sprintf('\u2191')) +
  geom_curve(aes(x = 4, y = 30, xend = 3.5, yend = 34), 
             colour = "#FF0000", 
             size=0.5, 
             curvature = -0.2,
             arrow = arrow(length = unit(0.03, "npc"))) +
  geom_label(aes(x = 4, y = 31, label = "Here is the\nUnicode symbol"), 
             hjust = 0, 
             vjust = 0.5, 
             colour = "#FAAB18", 
             fill = "white", 
             label.size = NA, 
             family="Helvetica", 
             size = 6)

Unicode for arrows from here

Here is the resulting plot:

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