[igraph] igraph and statnet

[Silvia Alvarez]

Hi everybody,

In a students seminar we tried to calculate basic network metrics using the igraph library. I also called the statnet library but used igraph functions for the estimations. When comparing my output with that of my class mates who didn't call statnet, the values were different. I didn't get any warning or error but the values were wrong. I tried to solve this by removing the statnet library (I actually delete it completely from my computer) but I kept getting the same wrong values. I tried it in other computers and I got the same wrong values. Has anyone had similar issues when using igraph and statnet? Is there an explanation for this? Any ideas on how to solve it? I am new to igraph and other network packages, so I am not sure if this has been discussed before, but I haven't been able to find anything yet.

Best wishes,

Silvia

--
Silvia J. Alvarez

PhD Student, Biological Sciences

Behavior, Ecology, Evolution and Systematics (BEES)

University of Maryland

College Park, MD 20742

Email: salv...@umd.edu

www.clfs.umd.edu/biology/faganlab/people/alvarez.html

[Gábor Csárdi]

Well, you will need to tell us more about these wrong results, otherwise we cannot help you. 

What exactly did you do? What are the wrong results you are getting? 

Ideally you should give us a small piece of R code that we can run and the reproduces your problem. 

Gabor

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--
Gabor Csardi <csa...@rmki.kfki.hu>     MTA KFKI RMKI

[Silvia Alvarez]

Hi Gabor,

Thank you for the quick response. Here's the code:

library(igraph)

library(statnet)

##upload datase horse

horse<-read.csv("Horse.csv", header=T, row.names=1, check.names=F)

horse<-as.matrix(horse)

horse[6,2]=3

horse

##create adjacency matrix

hgraph<-igraph::graph.adjacency(horse, mode="undirected", weighted=NULL)

hgraph

igraph::degree(hgraph)

igraph::betweenness(hgraph, v=V(hgraph))

####End

The output I get is:

> igraph::degree(hgraph) [1] 37 25 11 41 36 12 18 27 13 > igraph::betweenness(hgraph, v=V(hgraph)) [1] 0.8144796 0.4841629 0.0000000 0.7533937 0.6968326 0.0000000 0.0000000 0.2511312 0.0000000

Thank you,

Silvia

2012/11/5 Gábor Csárdi <csa...@rmki.kfki.hu>

[Gábor Csárdi]

Hi Silvia,

the thing is, I still cannot run this code, because I don't have "Horse.csv". Also, you did not say why do you think the output is bad, and what do you think would be the correct output. For the graphs I have tried igraph and statnet give the same results for degree() and betweenness().

Please also include the output of the sessionInfo() function, because statnet and sna only recently have a namespace, and it matters which version you use.

Thanks, Gabor