在igraph数据框中查找与最大度数关联的节点名称

Question

I am using the igraph package to find degree of each node (the built in degree(g) function) and it returns a numeric vector. How can I tell which node has the maximum degree (not the value but the node name)?

Answer 1

If you have a igraph data frame G , then you can create a TRUE/FALSE vector with degree(G)==max(degree(G)) . You can then use that to find the name of the node(s) that meet that criteria - V(G)$name[degree(G)==max(degree(G))] .

I created a small example to illustrate:

library(igraph)
df = data.frame(node1=c("Bob", "Jim", "Dave", "Dave"),
                node2=c("Jane", "John", "Sally", "Al"))

G = graph.data.frame(df)
V(G)$name[degree(G)==max(degree(G))]
[1] "Dave"

Answer 2

Example data

dat<-sample(0:100,100,rep=FALSE)
maximum<-dat[order(dat,decreasing = TRUE)

Verify

maximum