Sort and rename facet labels in ggplot2

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使用ggplot2作图时，对facet的label进行排序和重命名。

Sort

把含有labels的列转换为factor，并设定它的level，ggplot2就会自动按照level来排序。

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n <- n %>%
    mutate(strength = factor(strength, levels = c("S", "M", "W")))

Rename

创建一个named vector，把原来的label对应到name上，然后再作图的时候使用labeller函数。

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ss_labels <- c(S = "Strong", M = "Medium", W = "Weak")

p <- (
    ggplot(n, aes(...))
    + geom_col(position = position_dodge())
    + facet_wrap(~strength, labeller = labeller(strength = ss_labels))
    ...
)

References

1. https://stackoverflow.com/questions/14262497/fixing-the-order-of-facets-in-ggplot ↩
2. http://www.cookbook-r.com/Graphs/Facets_(ggplot2)/ ↩