> On 25 May 2017, at 11:25, Tamas Nepusz <[email protected]> wrote:
>
> 1- Is there a neat way of reading a METIS file with .graph extension as in
> http://www.cc.gatech.edu/dimacs10/archive/clustering.shtml
> <http://www.cc.gatech.edu/dimacs10/archive/clustering.shtml> data sets using
> igraph?
> No, as far as I know -- you'll need to convert the file manually into
> something that igraph can digest.
>
> vertices for all vertices starting from 1 to the number of vertices. I could
> not construct an igraph graph from this list. graph.adj.list() function does
> not work with such type of adjacency lists?
> It should work, but note that the list is expected to be 0-indexed, i.e.
> neighboring vertices should be numbered from 0 and not 1. What is the error
> message that you see?
I had done the following:
dat <- readLines("karate.graph")
l <- lapply(dat, noquote)
gk <- graph.adjlist(l)
Error in .Call("R_igraph_adjlist", adjlist, mode, duplicate, PACKAGE =
"igraph") :
At structure_generators.c:84 : Invalid (negative) vertex id, Invalid vertex id
In addition: There were 33 warnings (use warnings() to see them)
however, I just notice that noquote function does not return a numeric vector.
also 0 index will require conversion.
thank you,
harun
>
> T.
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