R How to Draw a ggplot2 Barchart with Empty Factor Levels (Example Code)

my_df <- data.frame(group = LETTERS[1:4],    # Creating some example data
                    values = c(6, 3, 0, 4))
my_df <- my_df[my_df$values > 0, ]
my_df                                        # Printing example data
#   group values
# 1     A      6
# 2     B      3
# 4     D      4

my_df <- data.frame(group = LETTERS[1:4], # Creating some example data values = c(6, 3, 0, 4)) my_df <- my_df[my_df$values > 0, ] my_df # Printing example data # group values # 1 A 6 # 2 B 3 # 4 D 4

install.packages("ggplot2")                  # Install ggplot2 package
library("ggplot2")                           # Load ggplot2 package

install.packages("ggplot2") # Install ggplot2 package library("ggplot2") # Load ggplot2 package

my_plot <- ggplot(my_df,                     # Draw ggplot2 plot with default specifications
                  aes(x = group,
                      y = values,
                      fill = group)) +
  geom_bar(stat = "identity")
my_plot                                      # Draw barplot

my_plot <- ggplot(my_df, # Draw ggplot2 plot with default specifications aes(x = group, y = values, fill = group)) + geom_bar(stat = "identity") my_plot # Draw barplot

my_plot +                                    # Creating barplot again with scale_x_discrete
  scale_x_discrete(drop = FALSE)

my_plot + # Creating barplot again with scale_x_discrete scale_x_discrete(drop = FALSE)