CODEWITHSUNDEEP
rggplot2
dzeltzer
dzeltzer

Reputation: 1000

R ggplot facet lookup labeller

What's the syntax for using a data frame as a lookup table for facet labels (https://ggplot2.tidyverse.org/reference/labeller.html)? For example:

require(ggplot2)
df <- data.frame(value = c(1,3), variable = letters[c(1,3)])
labels <- data.frame(variable = letters[1:3], label = c("Apple", "Banana", "Cherry"))

Here's a failed attempt:

ggplot(df, aes(x = "x", y = value)) + geom_col() + facet_grid( ~ variable, labeller = as_labeller(labels))

Upvotes: 0

Views: 359

Answers (1)

learnjulia
learnjulia

Reputation: 193

you want a named character vector

labels <- data.frame(variable = letters[1:3], 
                     label = c("Apple", "Banana", "Cherry"),
                     stringsAsFactors = F)
ggplot(df, aes(x = "x", y = value)) + geom_col() +
  facet_grid( ~ variable, labeller = as_labeller(with(labels, setNames(label, variable))))

Upvotes: 1

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