cheatsheet
![](https://img.haomeiwen.com/i13133393/b154ad5d75ace872.png)
tidyr
![](https://img.haomeiwen.com/i13133393/21d94d1323265373.png)
- 数据框的变形
- 处理数据框中的空置
- 根据一个表格衍生出其他表格
- 实现列或行的分割和合并
数据框
![](https://img.haomeiwen.com/i13133393/7407b0ac5910b7a8.png)
Reshape Data
![](https://img.haomeiwen.com/i13133393/4df53cc09327a4e7.png)
Handle Missing Values
删除整行:drop_na()
根据上下文蒙一个:fill()
同一列的空置填上同一个数:replace_na()
Expand Tables
complete
complete(data, nedting()..., fill = list())
Expand
数据扩展组合行成新表![](https://img.haomeiwen.com/i13133393/e7d408decc7c0a76.png)
![](https://img.haomeiwen.com/i13133393/0287d86aae2c8575.png)
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