Re: [igraph] problem in theoretical maximum of closeness centrality

[Gábor Csárdi]

This is a bug then. Thanks!
https://github.com/igraph/igraph/issues/558

Best,
Gabor

On Fri, Dec 20, 2013 at 12:57 PM, Ju-Sung Lee <address@hidden> wrote:
> I believe there is some incorrect passing of parameters for the theoretical
> maximum of closeness centrality.
>
> The function 'centrality.c:igraph_centralization_closeness_tmax' accepts a
> 'mode' parameter (which often in other functions corresponds to
> 'out','in','all','total').  However, in
> 'rinterface.c:R_igraph_centralization_closeness_tmax', it is the
> 'c_directed' variable that is passed as 'mode' into
> 'igraph_centralization_closeness_tmax'.  Since 'c_directed' is a logical
> typed variable and will (presumably) have values of only 0 and 1 and 'mode'
> is typically assigned 1, 2, 3, or 4, the behavior of
> 'centrality.c:igraph_centralization_closeness_tmax' will not be as expected.
> Specifically, if one tries to use the 'nodes' parameter for the R function
> 'centralization.closeness.tmax' to obtain the theoretical maximum without
> specifying a graph, the result will be always be that of a directed graph
> even if one specifies directed=F for the R function as the C function
> 'centrality.c:igraph_centralization_closeness_tmax' tests only if the
> mode/c_directed value is 3 in order to produce the correct result for an
> undirected graph.
>
> Jay
>
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