ggplot2：标签表达式中的字体样式 [英] ggplot2: Font Style in label expression

问题描述

更改字体的面和大小在标签中无需表达即可使用。

  p < -  ggplot（data = mtcars，aes（x = wt，y = mpg））+ geom_point（）
p <-p + labs（x =权重，y =表达式（paste（mpg（，m ^ { -  2 }，））））
p <-p + opts（axis.title.x = theme_text（family =serif，face =bold，size = 12，angle = 00，hjust = 0.54 ，vjust = 0））
p <-p + opts（axis.title.y = theme_text（family =serif，face =bold，size = 12，angle = 90，vjust = 0.25）） 
 print（p）
  

任何帮助将不胜感激。谢谢

解决方案

我不认为它存在表达式，尽管你没有确切地说出你看到的是什么，所以很难确定。在Mac上，您可以使用粗体衬线字体显示xlab，但ylab不是粗体（尽管是以衬线显示）。如果我使用plotmath bold ，它将从表达式函数内部成功执行：

  p 
p <-p + opts（axis.title.y = theme_text family =serif，
 size = 12，angle = 90，vjust = 0.25））
p < -  p + opts（axis.title.x = theme_text（family =serif，face = bold，
 size = 12，angle = 00，hjust = 0.54，vjust = 0））
p 
  

与往常一样，图形设备通常是操作系统变量，并且您没有提供任何有关您的提示，因此进一步的评论被禁止。

（编辑：如果你引用指数-2，你可以得到它粗体（） - 编辑以及。）

 表达式（粗体mpg（m ^ bold（ -  2）））））
  

Changing font faces and sizes works well without expression in the labels. Here is the code where I've problem to change the font faces in label expression.

p <- ggplot(data = mtcars, aes(x=wt, y=mpg))+geom_point()
p <- p + labs(x="Weight", y=expression(paste("mpg (  ", m^{-2}, ")")))
p <- p + opts(axis.title.x = theme_text(family="serif", face="bold", size=12, angle=00, hjust=0.54, vjust=0))
p <- p + opts(axis.title.y = theme_text(family="serif", face="bold", size=12, angle=90, vjust=0.25))
print(p)

Any help would be highly appreciated. Thanks

解决方案

I do not think it is the presence of expression, although you don't say exactly what it is that you are seeing so it's difficult to be sure. On a Mac you get the xlab in bold-serif font, but the ylab is not bold (although it is in serif). If I use the plotmath bold it succeeds from inside the expression function:

p <- p + labs(x="Weight", y=expression( bold(mpg (m^-2) ) ) )
p <-  p + opts(axis.title.y = theme_text(family="serif", 
                                    size=12, angle=90, vjust=0.25))
p <- p + opts(axis.title.x = theme_text(family="serif", face="bold",
                                    size=12, angle=00, hjust=0.54, vjust=0))
p

As always, graphical devices are often OS-variable and you have not offered any hint about yours, so further commentary is inhibited.

(EDIT: If you quote the exponent -2 you can get it bold()-ed as well.)

expression( bold(mpg (m^bold("-2")) ) ) )

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