Hi,
I was wondering how the following result could happen. I am using
igraph::evcent for the calculation for my own model statistics. So I
make some experiments and repeat some statistics.
> a <- igraph::graph.ring(10) + igraph::graph.ring(10)
> igraph::evcent(a,scale=FALSE)$vector
[1] 0.2236051 0.2236051 0.2236051 0.2236051 0.2236051 0.2236051 0.2236051
[8] 0.2236051 0.2236051 0.2236051 0.2236084 0.2236084 0.2236084 0.2236084
[15] 0.2236084 0.2236084 0.2236084 0.2236084 0.2236084 0.2236084
> a <- igraph::graph.ring(10) + igraph::graph.ring(10)
> igraph::evcent(a,scale=FALSE)$vector
[1] 0.2236066 0.2236066 0.2236066 0.2236066 0.2236066 0.2236066 0.2236066
[8] 0.2236066 0.2236066 0.2236066 0.2236070 0.2236070 0.2236070 0.2236070
[15] 0.2236070 0.2236070 0.2236070 0.2236070 0.2236070 0.2236070
> a <- igraph::graph.ring(10) + igraph::graph.ring(10)
> igraph::evcent(a,scale=FALSE)$vector
* [1] 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000
0.0000000**
** [8] 0.0000000 0.0000000 0.0000000* 0.2236073 0.2236073 0.2236073
0.2236073
[15] 0.2236073 0.2236073 0.2236073 0.2236073 0.2236073 0.2236073
As you can see I get in return different values (zeros) at the third
try. There are some zero values How could that happen? It also happens
with scale=TRUE.
> a <- igraph::graph.ring(10) + igraph::graph.ring(10)
> igraph::evcent(a)$vector
[1] 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1
> a <- igraph::graph.ring(10) + igraph::graph.ring(10)
> igraph::evcent(a)$vector
[1] 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1
> a <- igraph::graph.ring(10) + igraph::graph.ring(10)
> igraph::evcent(a)$vector
[1] 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
> a <- igraph::graph.ring(10) + igraph::graph.ring(10)
> igraph::evcent(a)$vector
[1] 0.9999876 0.9999876 0.9999876 0.9999876 0.9999876 0.9999876 0.9999876
[8] 0.9999876 0.9999876 0.9999876 1.0000000 1.0000000 1.0000000 1.0000000
[15] 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000
Thank you for answers.
R version 3.0.1 (2013-05-16)
Platform: x86_64-w64-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=German_Germany.1252 LC_CTYPE=German_Germany.1252
[3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C
[5] LC_TIME=German_Germany.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] igraph_0.6.5-1
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