I want to construct a new centrality measure using igraph, preferably in R. How would I begin this? For example, would I be better adding to the igraph C library or the R interface?
Thanks
Conor
I want to construct a new centrality measure using igraph, preferably in R. How would I begin this? For example, would I be better adding to the igraph C library or the R interface?
Thanks
Conor
This really boils down to what your comfortable level. That said, igraph is a primarily a C library (you can browse all the source code on sourceforge), so the most logical way to extend it is probably in C. For instance, the closeness function in R just call the related C function:
> closeness
function (graph, v = V(graph), mode = c("all", "out", "in"))
{
if (!is.igraph(graph)) {
stop("Not a graph object")
}
mode <- igraph.match.arg(mode)
mode <- switch(mode, out = 1, `in` = 2, all = 3)
on.exit(.Call("R_igraph_finalizer", PACKAGE = "igraph"))
.Call("R_igraph_closeness", graph, as.igraph.vs(v), as.numeric(mode),
PACKAGE = "igraph")
}
Here is the existing centrality sourcecode.