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

**From**: |
Gábor Csárdi |

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

**Date**: |
Fri, 20 Dec 2013 19:52:23 -0600 |

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*
>
>* _______________________________________________*
>* igraph-help mailing list*
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>* https://lists.nongnu.org/mailman/listinfo/igraph-help*
>