CODEWITHSUNDEEP
rigraph
Bill
Bill

Reputation: 203

Igraph number of connected nodes with specific attribute value

I have a graph:

g <- make_empty_graph (2) %>%
  set_vertex_attr("a", value = 1) %>%
  add_vertices(2, color = 2, "a" = 2) %>%
  add_vertices(2, color = 4, "a" = 3) %>%
  add_edges(c(1, 2, 2, 1, 1, 5, 5, 1, 1, 4, 4, 1))
plot(g)

Is there a way to find out how many nodes with a value of 2 for the attribute "a" are connected to the node "1"?

Graph IMG

Upvotes: 0

Views: 814

Answers (1)

G5W
G5W

Reputation: 37641

You can get the neighbors of node 1 using neighbors and then test for which ones have "a"=2.

NeighborList = neighbors(g, 1)
NeighborList[NeighborList$a == 2]
+ 1/6 vertex, from 3502fa5:
[1] 4

Upvotes: 1

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