> I am using Modularity to evaluate the goodness of community division.
> In order to get the largest modularity, a while loop is used to record the
> modularity value of different "step", which is a parameter of function
> "igraph_community_leading_eigenvector()". In such way, I record 100
> modularity value, and find the largest one corresponding to the "step" value
> 48. I initialized the membership vector and arpack option parameters for
> every loop.
> However, to verify the result, I set the "step" to 48, and rerun the program
> (just one time). The modularity value I get this time is different from that
> obtained by the while loop. I am a bit confused.
Hi,
> On Sat, Dec 19, 2009 at 5:13 PM, zhengjun chen <
zhjchen.sa@
gmail.com> wrote:
>>
>> Hi,
>> I have a question about community detection in
>> Igraph."igraph_community_leading_eigenvector()" function is used to detect
>> communities.
>> My question is what is the meaning of "steps" in this function. Does it
>> mean the number of community split operation?
>> When I change this value from 10 to 100, more and more communities have
>> been detected. So, the parameter "steps" should be set to what?
>> In addition, I have no idea about how many communities actually exist. So,
>> what can I do to verify that the communities detected is good enough?
>> I am also a bit confused of the structure igraph_arpack_options_t. Now I
>> just initialize it to default values.
>>
>> --
>> Thanks
>> zhengjun
>>
>> Graduate research assistant
>> Dept of Computer Science and Engineering
>> Lehigh University
>
>
>
> --
> Thanks
> zhengjun
>
> Graduate research assistant
> Dept of Computer Science and Engineering
> Lehigh University
>