根据几列制作 group_indices [英] Make a group_indices based on several columns

问题描述

我想生成索引以基于两列对观察进行分组.但我希望小组由观察组成，至少有一个共同的观察.我可以看到如何根据具有共同观察结果的观察结果分组，但不仅仅是其中一个观察结果.

I would like to generate indices to group observations based on two columns. But I want groups to be made of observation that share, at least one observation in commons. I can see how to make groups based on observations that share both observation in common, but not just one of them.

以数据框为例:

dt <- data.frame(id=1:10,
             G1 = c("A","A","B","B","C","C","C","D","E","F"),
             G2 = c("Z","X","X","Y","W","V","U","s","T","T"))

我想要一个专栏

1,1,1,1,2,2,2,3,4,4

我尝试使用 dplyr 中的 group_indices，但没有成功.

I tried with group_indices from dplyr, but haven't managed it.

推荐答案

使用 igraph 获取成员资格，然后映射名称:

Using igraph get membership, then map on names:

library(igraph)

# convert to graph, and get clusters membership ids
g <- graph_from_data_frame(df1[, c(2, 3, 1)])
myGroups <- components(g)$membership

myGroups 
# A B C D E F Z X Y W V U s T 
# 1 1 2 3 4 4 1 1 1 2 2 2 3 4 

# then map on names
df1$group <- myGroups[df1$G1]


df1
#    id G1 G2 group
# 1   1  A  Z     1
# 2   2  A  X     1
# 3   3  B  X     1
# 4   4  B  Y     1
# 5   5  C  W     2
# 6   6  C  V     2
# 7   7  C  U     2
# 8   8  D  s     3
# 9   9  E  T     4
# 10 10  F  T     4

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