问题
I am trying to plot some graph using ggplot2 in R and label the legends using unicode characters such as Japanese. The following is my code:
ggplot(mtcars, aes(x=mpg, y=wt, colour = 'ああ')) + geom_line()
But I end up getting the following plot:
The legend is not displayed properly. Could anyone tell me how to fix this? Thank you so much!!
来源：https://stackoverflow.com/questions/39348634/unicode-characters-in-ggplot-legend