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Re: [igraph] to find connected components in the network

From: Rachita Halehalli
Subject: Re: [igraph] to find connected components in the network
Date: Mon, 5 Jul 2010 18:55:42 +0530

Thanks for your inputs. from past one week internet was down here.

I have 11 networks each one having nearly 11000 nodes and over 50000edges.
When i was trying to find shortest paths it wasn't fitting into memory.
Clusters actually gives one large connected component with over 10000nodes and about 400 peripheral connections with 2-6nodes.

I need to find highly connected subgragphs in the large component which r connected by articulation point. Even after removing node i get same results for clusters function.
It is same with decompose graph.
 What should i do to get local subcomponents which are connected by articulation points?
I want to find out what are these components/ subgraphs and their local network properties and function.
Thanks and regards
On 30 June 2010 20:59, Gábor Csárdi <address@hidden> wrote:

what exactly is tedious? If I understand you correctly, all you need
to do is removing the articulation points one by one from the network,
and then calling clusters() or decompose.graph() on the remainder

If your graph is not too big and everything fits into the memory, then
you can do all this with

rem <- lapply(A, delete.vertices, graph=g)
comps <- lapply(rem, decompose.graph)

where 'A' is the number vector with the articulation points and 'g' is
your graph. If you just need the vertex ids and not the actual graphs,
then use 'clusters' instead of 'decompose.graph', 'clusters' is much

Is this what you want?


On Wed, Jun 30, 2010 at 4:26 PM, Rachita Halehalli <address@hidden> wrote:
> Hi,
> Can any one help me out to find components in the network.
> I have list of articulation points for a network.
> Now i want to find out the different components that each articulation point
> connects..
> Degree of articulation points in the list  varies from 2 to 100. It becomes
> very tedious to use fucntion 'subcomponent'.
> Thanks and warm regards
> -Rachita Halehalli
> Graduate student
> Hyderabad
> _______________________________________________
> igraph-help mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/igraph-help

Gabor Csardi <address@hidden>     UNIL DGM

Thanks and warm regards,

Rachita H R
Graduate Student

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