CODEWITHSUNDEEP
rigraph
user2170547
user2170547

Reputation: 361

Get the vertex names of an edge

when I use "E(hu)[12]" for selecting a vertex I get the following output:

[12] A  -- B

Now I need the names for these two vertices. How can I select the names/labels "A" and "B"? Thanks!

Upvotes: 3

Views: 1514

Answers (2)

Gabor Csardi
Gabor Csardi

Reputation: 10825

You can use inc() when indexing a vertex set, to get the incident vertices of an edge. This is probably the most readable:

# Some example data
library(igraph)
hu <- graph.ring(20)
V(hu)$name <- letters[1:20]

V(hu)[ inc(12) ]
# Vertex sequence:
# [1] "l" "m"

V(hu)[ inc(12) ]$name
# [1] "l" "m"

Upvotes: 3

user2170547
user2170547

Reputation: 361

I guess I could finally figure it out

V(g)[get.edges(hu, E(g)[12])[1]]
V(g)[get.edges(hu, E(g)[12])[2]]

Seems a bit too complex but it works...

Upvotes: 1

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