Re: [igraph] I'm getting Different MST each time

[Gábor Csárdi]

A have just run this 100 times, it always gave me the same MST. Please make sure that the problem exists for this file. If it really does, then send me the output of the sessionInfo() function. Thanks.

G.

On Mon, Apr 22, 2013 at 10:31 PM, jameson mcfarlane <address@hidden> wrote:

Gabor,
   Here is a sample .csv file.
 
Thanks,
Jameson 

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Date: Mon, 22 Apr 2013 22:14:24 -0400
From: address@hidden
To: address@hidden
Subject: Re: [igraph] I'm getting Different MST each time

Hi, unfortunately we cannot run your code because we don't have the .csv file. Please send some self-contained example that reproduces the problem, e.g. make up some toy data. See e.g.

http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

Thanks,

Gabor

On Mon, Apr 22, 2013 at 9:44 PM, jameson mcfarlane <address@hidden> wrote:

Hello,
     I am creating a minimum spanning tree (MST) with i-graph. For some reason, I seem to get a different MST diagram (nodes in different order) each time I run it. For example, sometimes the primary tree node is say "Jon K.". Other times, it could be "Larry Z." Could any help with what I am doing wrong?
 
Here is the code:
 
library(igraph)
tab <- read.csv("NewJam12.csv")
tab <- tab[,-1]
g <- graph.adjacency(as.matrix(tab), weighted=TRUE)
V(g)$label <- V(g)$name
mst <- as.undirected(minimum.spanning.tree(g))

lay <- layout.reingold.tilford(mst, root=which.max(degree(mst))-1)
lay <- cbind(lay[,2], lay[,1])    # rotate
x11(width=20, height=10)
plot(mst, layout=lay, vertex.size= 5, vertex.size2=15,
     vertex.shape="circle", asp=FALSE,
     vertex.label.cex=0.5, vertex.color="green")

 

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Gabor Csardi <address@hidden>     MTA KFKI RMKI

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Gabor Csardi <address@hidden>     MTA KFKI RMKI