How can I use facets in ggplot2 to create multi-panel plots?

How can I use facets in ggplot2 to create multi-panel plots?

You can use the facet_wrap() or facet_grid() functions in ggplot2 to create multi-panel plots. Would you like an example?

Yes, please provide an example using the mtcars dataset.

Sure! Here's a simple example:

library(ggplot2)

# Basic scatter plot with facets
ggplot(mtcars, aes(x=wt, y=mpg)) + 
  geom_point() + 
  facet_wrap(~ cyl)

This will create separate panels for each cylinder count in the mtcars dataset.

What if I want to customize the scales for each facet?

You can customize the scales by adding the scales argument in facet_wrap(). For example:

ggplot(mtcars, aes(x=wt, y=mpg)) + 
  geom_point() + 
  facet_wrap(~ cyl, scales='free')

This allows each facet to have its own scale.