子集igraph对象到某些顶点的2阶自我图 [英] subset igraph object to just 2nd order ego graph of certain vertices

问题描述

构建此处的问题 ，是否有一种方法可以扩展此子图，使其包括以两个角度连接到顶点子集的顶点?我正在考虑一个类似于make_ego_graph()中的功能的命令，其中order = 2和mode ="in".我正在使用有向图对象.

Building off this question here, is there a way to extend this subgraph to include vertices connected by two degrees to a subset of vertices? I'm thinking of a command similar to the functions in make_ego_graph() where order=2 and mode="in". I'm working with a directed graph object.

到目前为止，我已经提出了以下内容，但它并未生成我想要的图形.

Thus far, I've come up with the following, but it's not producing the graph I'm looking for.

first_degree <- V(graph)$condition == "something"
second_degree <- V(graph)[to(first_degree)]
edges_subset <- E(graph)[to(first_degree) | to(second_degree)]
desired_subset <- subgraph.edges(graph, edges_subset)

感谢您可以给我的任何建议！

Thanks for any advice you can give me!

推荐答案

这不是最优雅的解决方案，但它似乎可以工作.

It's not the most elegant solution, but it seems to work.

 ego.list <- make_ego_graph(graph, order=2, nodes=V(graph)$condition=="something")

   desired_subset <- NULL
   for (i in seq_along(ego.list)){
   x <- ego.list[[i]]
   desired_subset <- graph.union(desired_subset, x)
}

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