i have made graph using 'igraph' library , function 'graph.formula' edges appearing light in color. how can make lines dark/bold?
not sure graph want igraph package. here example comes following tutorial . can adapt parameter edge.width:
g <- barabasi.game(100) plot(g, layout=layout.fruchterman.reingold, vertex.size=4, vertex.label.dist=0.5, vertex.color="red", edge.arrow.size=0.5, edge.width=2) 