基于 R 中第一列中的重复行进行 reshape

Question

我想知道如何 reshape 以下数据集:

这是生成以下内容的代码:

data.frame(Variable = c("Date","Location_1","Location_2","Date","Location_1","Location_2"),
           Monday = c("7/1/20","1","2","7/3/20","1","2"),
           Tuesday = c("7/2/20","5","2","7/4/20","5","2"))


Variable    Monday Tuesday 
Date        7/1/20  7/2/20     
Location_1     1       5                 
Location_2     2       2      
Date         7/3/20  7/4/20  
Location_1     1       5                
Location_2     2       2     

进入

Date      Location_1 Location_2
7/1/20        1          2          
7/2/20        5          2                  
7/3/20        1          2          
7/4/20        5          2          

我不确定为什么我在正确使用转置方面遇到困难，但这似乎是我缺少的一个简单的解决方案。任何帮助将不胜感激。

谢谢!

Answer 1

获取长格式的数据，创建标识符列并返回宽格式。

library(dplyr)
library(tidyr)

df %>%
  pivot_longer(cols = -Variable) %>%
  select(-name) %>%
  group_by(Variable) %>%
  mutate(row = row_number()) %>%
  pivot_wider(names_from = Variable, values_from = value) %>%
  select(-row)

#  Date   Location_1 Location_2
#  <chr>  <chr>      <chr>     
#1 7/1/20 1          2         
#2 7/2/20 5          2         
#3 7/3/20 1          2         
#4 7/4/20 5          2         

---

在data.table中使用melt + dcast

library(data.table)

dcast(melt(setDT(df), id.vars = 'Variable'), rowid(Variable)~Variable,
      value.var = 'value')