[igraph] Getting a subgraph of a graph whose nodes have certain attributes

[Peter Flom]

Hello again

 

I am trying to get a subgraph of a graph where the nodes have certain attributes. I tried

 

vs <- traits$Position[traits$Volume > 50]

g50 <- subgraph(g, vs)

 

But vs contains many NA’s and the run of g50 gives the following

 

Traceback:

1: .Call("R_igraph_subgraph", graph, as.igraph.vs(graph, v), PACKAGE = "igraph")

2: subgraph(g, vs)

Error in subgraph(g, vs) : caught access violation - continue with care

 

This seems simple, but I can’t see what I am doing wrong.

 

Thanks in advance

 

Peter