ggplot 更改 x 轴标签而不更改基础数据

我在 x 轴上绘制小平面和离散数据。如何更改 x 轴标签without改变底层数据？ IE。而不是标签阅读"a","b","c","d"他们应该阅读"Lab 1","Lab 2","Lab 3","Lab 4".

df <- data.frame(x = factor(rep(c("a","b","c","d"),4), levels = c("a","b","c","d")),
                 y = rep(seq(1,8,1),2),
                 z = c(rep("x",4),rep("y",4)),
                 facet = rep(c(rep("1",2),rep("2",2)),4))


ggplot(NULL) +
  geom_line(data=df, aes(y=y, x=x, linetype=z, group = z, colour=z)) +
  facet_grid(~facet, scales="free_x", space="free_x") +
  scale_colour_manual(values=c("Red","Blue")) +
  scale_linetype_manual(values=c("solid", "dashed"))

您可以使用命名的字符向量labels论证中scale_x_discrete.

scale_x_discrete(labels = c("a" = "Lab 1", "b" =  "Lab 2", "c" = "Lab 3", "d" = "Lab 4") )

或者，您可以同时提供breaks and labels

scale_x_discrete(breaks = c("a", "b", "c", "d"), 
                 labels = c("Lab 1", "Lab 2", "Lab 3", "Lab 4") )