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igraph graph.formula
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| ## Create undirected graphs | |
| g <- graph_from_literal(1-2, 1-3, 1-7, 3-4, 2-3, 2-4, 3-5, 4-5, 4-6, 4-7, 5-6, 5-8, 6-7, 7-8) | |
| ## Create directed graphs using addition or substraction operators | |
| dg <- graph_from_literal(JFK-+PEK, JFK-+CDG, PEK++CDG) |
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