CODEWITHSUNDEEP
rigraph
vidhya9
vidhya9

Reputation: 27

Deleting vertices in R

I am using igraph and trying to delete few vertices.When I try to delete vertex 77, I see vertex 78 which is connected to it being deleted rather than 77 itself...

library(graph)

out <- read.csv("~/Downloads/adj/out.adjnoun_adjacency_adjacency", sep="")

out.network<-graph.data.frame(out,directed = FALSE)

x<-delete_vertices(out.network,c(77))

plot(x)

Why is this.. Am I making mistake

Upvotes: 0

Views: 844

Answers (2)

deeenes
deeenes

Reputation: 4586

Are you sure vertex #78 gets deleted? igraph vertex indices are always continuous, so if you delete #77 the former #78 becomes the new #77, and the graph won't have #78 any more. We can demonstrate this with a vertex attribute corresponding to the indices before the deletion. The example below verifies that the original vertex #78 has the index #77 after deleting #77:

library(igraph)

g <- barabasi.game(n = 78, m = 3)

V(g)$original_index <- seq(1:vcount(g))

V(g)$original_index

V(g)$original_index[77]
[1] 77

g <- delete.vertices(g, c(77))

V(g)$original_index[77]
[1] 78

Upvotes: 1

vidhya9
vidhya9

Reputation: 27

this worked...

data1<-data1-V(data1)["23"]

Upvotes: 0

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