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R语言学习笔记5-应用TIDYR转置数据集

  • 2026-03-09 16:33:37
R语言学习笔记5-应用TIDYR转置数据集

R语言学习笔记5

用TIDYR转置数据集

日常工作中我们经常需要转置数据集。在R中TIDYR包提供了两个函数来转置数据集：

pivot_wider：将一列数据转置成多列

pivot_longer：将多列数据转置成一列

 pivot_wider函数       

#首先安装tidyr

访问网页https://cran.r-project.org/web/packages/tidyr/index.html

找到下载链接，根据你的系统选择对应安装包

用以下语句安装包，注意地址写你的安装包地址

以下程序，转置数据集data_test为data_test_w,其中value由一列数据变成了两列数据分别是test1和test2.

------------------------------------

转置多个列：

原始数据如下

通过以下语句，转置value和value2 

转置后的数据集如下

pivot_longer函数

转置多列数据到一列：
原始的数据

用以下语句转置，转置的数据集是data_test3,转置的变量是数据集中除了id和visit以外的变量，变量的名称放到test里面，数值放到value里面。

转置后的数据集

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  1. CONNECT:[ UseTime:0.000552s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000805s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000285s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000235s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000251s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000579s ]
  8. SELECT * FROM `article` WHERE `id` = 472948 LIMIT 1 [ RunTime:0.000820s ]
  9. UPDATE `article` SET `lasttime` = 1773137715 WHERE `id` = 472948 [ RunTime:0.001382s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001452s ]
  11. SELECT * FROM `article` WHERE `id` < 472948 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005879s ]
  12. SELECT * FROM `article` WHERE `id` > 472948 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006969s ]
  13. SELECT * FROM `article` WHERE `id` < 472948 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010458s ]
  14. SELECT * FROM `article` WHERE `id` < 472948 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010143s ]
  15. SELECT * FROM `article` WHERE `id` < 472948 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009441s ]
0.120808s