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Setting order

If you want to change the order of your facets, it's best to properly define your factor variables before plotting.

Let's see this in action with the mtcars transmission variable am. In this case, 0 = "automatic" and 1 = "manual".

Here, we'll make am a factor variable and relabel the numbers to proper names. The default order is alphabetical. To rearrange them we'll call fct_rev() from the forcats package to reverse the order.

Cet exercice fait partie du cours

Intermediate Data Visualization with ggplot2

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Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Make factor, set proper labels explictly
mtcars$fam <- factor(mtcars$am, labels = c(`0` = ___,
                                           `1` = ___))

# Default order is alphabetical
ggplot(mtcars, aes(wt, mpg)) +
  geom_point() +
  facet_grid(cols = vars(fam))
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