Igraph in R: how to change edge color based on edge attribute

Question

I am trying to generate an Igraph in R. Now I want the edge color dependent on an edge attribute - department. I cannot use ifelse statement because department values can be dynamic. I can find the number of unique departments, but I am not sure how to proceed further in creating different edge colors for different departments.

    department= unique(edges$department)
    department.count=length(department)

Example Code:

    gg <- graph.atlas(711)
    V(gg)$name=1:7
    gg=set_edge_attr(gg,"Department",E(gg)1:10],c("A","B","C","A","E","C","G","B","C","A"))
    E(gg)$label=E(gg)$Department
    plot(gg)

I want to have different colors for each edge, depending on values of department in edge. All 'A' departments in one color , all B department edges in another color , so on. Kindly help.

jac jac · Accepted Answer · 2016-07-25T18:17:27

You should provide a small reproducible example when posting. That said, you should be able to do this by setting the color attribute of the edges:

E(testgraph)$color <- as.factor(edges$department)

Igraph in R: how to change edge color based on edge attribute

1 Answers