用ggtitle表示的希腊字母不会在r中变成斜体粗体。

Question

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plot19 <- ggplot(FoBlandAlt.apex, aes(x = avg, y = perc)) +
  geom_point(size=2, alpha = 0.5) +
  geom_hline(yintercept = percent_mean_diff) +
  geom_hline(yintercept = lower.perc, color = "black", linetype="dashed") +
  geom_hline(yintercept = upper.perc, color = "black", linetype="dashed") +
  ggtitle(expression(bolditalic(tau~(s) ~~STATSports))) +
  ylab("Difference from Criterion") +
  xlab("Mean")+theme_light()+
  theme(
    axis.title.y = element_text(color = "black", size=10),
    axis.title.x = element_text(color = "black", size=10),
    title = element_text(color= "black", size = 6, face = "bold.italic")
  )

我用我想要的方式设置了标题，但由于某种原因，τ符号(τ)不会像其他文本那样变成粗体。

Answer 1

ggplot(mtcars, aes(wt, mpg)) +
  labs(title = "τ(s) STATSports") +
  theme(title = element_text(face = "bold.italic"),
        axis.title = element_text(face = "plain"))

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