8、R语言数据可视化与分类模型构建

R语言数据可视化与分类模型构建

1. 生成便于比较的图表

1.1 准备工作

若尚未下载相关文件，需下载并将 daily-bike-rentals.csv 文件保存到 R 工作目录。使用以下命令读取数据：

bike <- read.csv("daily-bike-rentals.csv")
bike$season <- factor(bike$season, levels = c(1,2,3,4), labels = c("Spring", "Summer", "Fall", "Winter"))
attach(bike)

1.2 绘制直方图

1.2.1 使用基础绘图系统

步骤如下：
1. 设置 2X2 网格以绘制四个季节的直方图：

par(mfrow = c(2,2))

2. 提取各季节的数据：

spring <- subset(bike, season == "Spring")$cnt
summer <- subset(bike, season == "Summer")$cnt
fall <- subset(bike, season == "Fall")$cnt
winter <- subset(bike, season == "Winter"