工具：安装Rstudio

1. 下载

• R的清华大学镜像
  
• Rsutdio的官方链接

2. 利用load和head函数读取数据

先用load函数，再用head函数，好久不用都忘记了。
bike数据下载地址

> load("/Users/jiawei/Downloads/bike.RData")
> 
> head(bike)
  season   yr mnth    holiday weekday     workingday weathersit     temp
1 WINTER 2011  JAN NO HOLIDAY     SAT NO WORKING DAY      MISTY 8.175849
2 WINTER 2011  JAN NO HOLIDAY     SUN NO WORKING DAY      MISTY 9.083466
3 WINTER 2011  JAN NO HOLIDAY     MON    WORKING DAY       GOOD 1.229108
4 WINTER 2011  JAN NO HOLIDAY     TUE    WORKING DAY       GOOD 1.400000
5 WINTER 2011  JAN NO HOLIDAY     WED    WORKING DAY       GOOD 2.666979
6 WINTER 2011  JAN NO HOLIDAY     THU    WORKING DAY       GOOD 1.604356
      hum windspeed  cnt days_since_2011
1 80.5833 10.749882  985               0
2 69.6087 16.652113  801               1
3 43.7273 16.636703 1349               2
4 59.0435 10.739832 1562               3
5 43.6957 12.522300 1600               4
6 51.8261  6.000868 1606               5
>