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Hi all: I am very confused by reverse cost in pgdijkstra. I run against sample data (roads_europe).
1) Calculate from node 27 to node 19. Set has_reverse_cost to true and set the graph is directed. SELECT * FROM shortest_path('SELECT id, source, target, cost, reverse_cost
FROM roads_europe_edges', 27, 19, true, true); It returned 47 rows 2) Calculate from node 19 to node 27. Set has_reverse_cost to false and set the graph is directed. SELECT * FROM shortest_path('SELECT id, source, target, cost FROM roads_europe_edges',
19, 27, true,
false); It returned a message: no path found. If second statement cannot return a path, how the first
statement can calculate reverse cost? Thanks for any help. Fay |
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