转换“ dist”类的对象进入R中的数据帧 [英] convert object of class "dist" into data frame in r

问题描述

如果有可能将数据帧转换为 dist类的对象，是否有可能做相反的事情？将类 dist转换为数据框？例如

if possible to convert a data frame to an object of class "dist" is it possible to do just the opposite? convert class "dist" to data frame? for example

< dist（hasil）

< dist(hasil)

   1            2            3           4
2  0.088814413                                    
3  0.084929382  0.030413813                        
4  0.063245553  0.029120440 0.044418465            
5  0.061983869  0.027018512 0.036400549 0.009055385

并在数据框中显示结果

<

   col          row          distance
   1            2            0.088814413
   1            3            0.084929382          
   1            4            0.063245553
   1            5            0.061983869
   2            3            0.030413813
   2            4            0.029120440
   2            5            0.027018512
   3            4            0.044418465
   3            5            0.036400549
   4            5            0.009055385

推荐答案

library(maps)
data(us.cities)

d <- dist(head(us.cities[c("lat", "long")]))

##           1         2         3         4         5
## 2 20.160489                                        
## 3 23.139853 40.874243                              
## 4 15.584303  9.865374 38.579820                    
## 5 27.880674  7.882037 48.707100 15.189882          
## 6 26.331187 41.720457  6.900101 41.036931 49.328558

library(reshape2)

df <- melt(as.matrix(d), varnames = c("row", "col"))

df[df$row > df$col,]
##    row col     value
## 2    2   1 20.160489
## 3    3   1 23.139853
## 4    4   1 15.584303
## 5    5   1 27.880674
## 6    6   1 26.331187
## 9    3   2 40.874243
## 10   4   2  9.865374
## 11   5   2  7.882037
## 12   6   2 41.720457
## 16   4   3 38.579820
## 17   5   3 48.707100
## 18   6   3  6.900101
## 23   5   4 15.189882
## 24   6   4 41.036931
## 30   6   5 49.328558

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