I am working with a graph that has 121 vertices and 209 edges and I am trying to remove from this graph vertices that satisfy two conditions:
degree(my.graph)==0
Here is an example showing what I want to get. From the following graph:
toy.graph <- graph.formula(121-221,121-345,121-587,345-587,221-587, 490, 588)
I want to remove vertices with degree 0 that start with 5. In this case I want to remove only vertex 588 (but not 490 and 587). I know how to remove vertices starting with 5:
delete.vertices(toy.graph,V(toy.graph)$name
%in% grep("^5",V(toy.graph)$name,value=T))
and how to remove vertices with degree 0:
delete.vertices(toy.graph, V(toy.graph)[degree(toy.graph)==0])
but when I try to put these two conditions together, that is
delete.vertices(toy.graph, V(toy.graph)$name %in%
grep("^5",V(toy.graph)$name,value=T)
&& V(toy.graph)[degree(toy.graph)==0])
it does not work and I get back the full graph. Is there a special way of combining multiple conditions for removing vertices?
Thank you!
I believe this is what you want:
delete.vertices(toy.graph,
V(toy.graph)[ degree(toy.graph) == 0 &
grepl("^5", V(toy.graph)$name) ] )
pozdrawiam :)
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