R绘制具有n，n+1，....的因子水平的数目。计数

# 安装并加载ggplot2包
install.packages("ggplot2")
library(ggplot2)

# 创建一个包含因子水平的向量
factors <- factor(c("n", "n+1", "n+2", "n+3"))

# 绘制因子水平的数目
plot <- ggplot(data.frame(factors), aes(x = factors)) +
  geom_bar(fill = "blue") +
  labs(x = "因子水平", y = "数目", title = "因子水平的数目") +
  theme_minimal()

# 显示绘图
print(plot)