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


i trying generate igraph in r. want edge color dependent on edge attribute - department. cannot use ifelse statement because department values can dynamic. can find number of unique departments, not sure how proceed further in creating different edge colors 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 have different colors each edge, depending on values of department in edge. 'a' departments in 1 color , b department edges in color , on. kindly help.

you should provide small reproducible example when posting. said, should able setting color attribute of edges:

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

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