> I like to know if you can have round arcs and straight arcs under one > graph using igraph. > Yes; edge.curved=... may be a vector containing one item for each edge. TRUE means curved edge, FALSE means straight edge; you may also pass numbers to control how curved the edges should be.
Quoting the documentation: "First the vector is replicated to have the same length as the number of edges in the graph. Then it is interpreted for each edge separately. A numeric value specifies the curvature of the edge; zero curvature means straight edges, negative values means the edge bends clockwise, positive values the opposite. TRUE means curvature 0.5, FALSE means curvature zero." See https://igraph.org/r/doc/plot.common.html Second, ggplot2 allows me to add lines to existing plot, can igraph > provides this option? > Sorry, I don't know, I'm not that familiar with R. All the best, Tamas
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