如何在R中给条形图上的标签添加$ sign？[包含图像和代码]

library(ggplot2)

# 创建数据框
data <- data.frame(category = c("A", "B", "C", "D"),
                   value = c(100, 200, 300, 400))

# 创建条形图
plot <- ggplot(data, aes(x = category, y = value)) +
  geom_bar(stat = "identity", fill = "blue") +
  theme_minimal()

# 添加标签
plot <- plot + geom_text(aes(label = paste0("$", value)), vjust = -0.5)

# 显示图形
print(plot)