r - ggplot change x-axis labels without changing underlying data -


i plotting facets , discrete data on x-axis. how can change x-axis labels without changing underlying data? i.e. instead of labels reading "a","b","c","d" should read "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"))

you can use named character vector labels argument in scale_x_discrete.

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

alternatively, give both breaks , labels

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

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