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rigraphedges

igraph other names for edges

I have an other question to: this topic

Is it in igraph possible to give other names for edges ("E1", "E2", "E3") than standart letters like "a","b","c"? And later create the shortest path output with them("E1","E2","E3")

Thank you ;)

Solution

  • Instead of using a name attribute for the edges, and then specifying it in your plot statement, it would be better to use what igraph uses - the label attribute.

    library(igraph)
solid = graph_from_literal(A-D,A-C,D-F,D-C,C-B,B-E)
E(solid)$label <- paste0("E", seq_len(ecount(solid)))
plot(solid)

    Solid

    This will allow you to get at the shortest paths as well. The shortest_paths function returns a structure that has the edgelist stored in $epath. You can get the labels of the whole path from there

    lapply(shortest_paths(solid, from='A', to ='F', output='epath')$epath, 
    function(x) { x$label })
[[1]]
[1] "E1" "E4"