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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