The “theme_bw” Function in R

• Package: ggplot2

• Purpose: To apply a black and white theme to ggplot objects, providing a clean and simple appearance.

• General Class: Theme

• Required Argument(s): None

• Notable Optional Arguments:

• base_size: The base font size for the plot.

• base_family: The base font family for the plot.

• base_line_size: The base line size for elements like axis lines.

• base_rect_size: The base size for elements like rectangles.

• base_rect_rel_size: The base size relative to the overall height of the plot for elements like rectangles.

• base_rect_hjust: The base horizontal justification for elements like rectangles.

• Example:

• # Example usage
  library(ggplot2)
  
  # Run this code for special fonts using a Windows device.
  # After the functions are run once, the extrafont...
  # package only needs to be libraried for subsequent use.
  library(extrafont)
  font_import()
  loadfonts(device = "win")
  
  # Create a data frame
  my_data <- data.frame(
  x_values = seq(1, 10),
  y_values = rnorm(10)
  )
  
  # Create a ggplot object with a black and white theme, remove base_family if Arial is unavailable.
  my_plot <- ggplot(data = my_data, aes(x = x_values, y = y_values)) +
  geom_point() +
  theme_bw(base_size = 14, base_family = "Arial", base_line_size = 1)
  
  # Print the plot
  print(my_plot)

• In this example, the theme_bw function is used to create a ggplot object with a black and white theme. Optional arguments such as base_size and base_family are customized to control the font size and family, allowing users to tailor the appearance of the plot to their preferences.