Re: [igraph] two-mode network in igraph

[Simone Gabbriellini]

done, it works poerfectly, thanks a lot!

simone

Il giorno 24/set/2010, alle ore 15.31, Gábor Csárdi ha scritto:

> On Fri, Sep 24, 2010 at 3:28 PM, Simone Gabbriellini
> <address@hidden> wrote:
>> Tamas,
>> 
>> this is a much more simpler way! thanks a lot!
>> 
>> and all I have to do is something like:
>> 
>> V(g)$type<-ifelse(grep("thread",V(g)$name)==1, FALSE, TRUE)
> 
> Use 'grepl' instead of 'grep', that returns a logical vector and you
> don't even need the 'ifelse'.
> 
> G.
> 
>> to set the type attribute... I know that code doesn't work, still have to 
>> find a way, but I got the point
>> 
>> thanks,
>> simone
>> 
>> Il giorno 24/set/2010, alle ore 14.38, Tamas Nepusz ha scritto:
>> 
>>>> do I have to put in the type vector one element of the first kind, one of 
>>>> the second kind, one of the first... etc???
>>> Nope. The type vector must have N elements if you have N vertices, and the 
>>> i-th element must be 0 if vertex i is of the first type, or 1 if vertex i 
>>> is of the second type.
>>> 
>>>> is there no way to let igraph knows about the actual names of the vertex?
>>> You can use vertex attributes, but only after you have created the graph 
>>> with numeric vertex IDs. igraph does not allow arbitrary objects or strings 
>>> as vertex identifiers, only numbers.
>>> 
>>> On the other hand, note that bipartite graphs are not special in any way in 
>>> igraph, so you can create a "regular" graph first using any other methods 
>>> (e.g., read from an NCOL file that allows vertex names, or use 
>>> graph.formula). The only distinguishing feature for bipartite and 
>>> non-bipartite graphs is the "type" vertex attribute, but you can assign 
>>> that later!
>>> 
>>> For instance, suppose this is your original graph:
>>> 
>>> author1 thread1
>>> author2 thread1
>>> author1 thread2
>>> author3 thread2
>>> author3 thread3
>>> 
>>> Load this as an NCOL file, then go through the vertex names and create a 
>>> 0-1 type vector using the names (e.g., if the name starts with "author", 
>>> then it is of type 0, if the name starts with "thread", then it is of type 
>>> 1). Finally, assign the type vector to the "type" attribute (V(g)$type <- 
>>> types) and you're ready.
>>> 
>>> --
>>> Tamas
>>> 
>>> 
>>> _______________________________________________
>>> igraph-help mailing list
>>> address@hidden
>>> http://lists.nongnu.org/mailman/listinfo/igraph-help
>> 
>> 
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> 
> 
> 
> -- 
> Gabor Csardi <address@hidden>     UNIL DGM
> 
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