Re: [igraph] Output from degree

[Gábor Csárdi]

Your graph has vertex names, so igraph adds the vertex names to the output of degree():

g <- graph.ring(10)

degree(g)

#  [1] 2 2 2 2 2 2 2 2 2 2

V(g)$name <- letters[1:10]

degree(g)

# a b c d e f g h i j 

# 2 2 2 2 2 2 2 2 2 2 

If you want to omit the names entirely from the graph, then remove the "name" vertex attribute.

If you don't want to add vertex names to results of any vertex indices, then set the "add.vertex.names" igraph option to FALSE:

igraph.options(add.vertex.names=FALSE)

degree(g)

# [1] 2 2 2 2 2 2 2 2 2 2

Gabor

On Wed, Mar 12, 2014 at 4:19 AM, Thomas <address@hidden> wrote:

Can anyone please explain why this is happening? With two different graphs, the output format from degree() is different. I'd like to force the second format (output just one number) on the first graph.

Thank you,

Thomas Chesney

i <- 5

g <- read.table("/Users/thomas/Documents/Datasets/organizations/S1Anonymized.csv",header=FALSE, sep=",", na.strings="NA", dec=".", strip.white=TRUE)
g <- graph.data.frame(g, directed=FALSE, vertices=NULL)

degree(g,i)
69
 1

f <- watts.strogatz.game(1, 165, 5, 0.05)
degree(f,i)
[1] 8

str(degree(g,i))
 Named num 1
 - attr(*, "names")= chr "69"

str(degree(f,i))
 num 8

I'm using R:

> sessionInfo()
R version 2.15.3 (2013-03-01)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] igraph_0.6.5-1

loaded via a namespace (and not attached):
[1] tools_2.15.3

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