Hi and happy new year graph coders!
The shortest_distance function implements the Floyd's algorithm. I am carefully following the example provided by the docs <https://graph-tool.skewed.de/static/doc/topology.html#graph_tool.topology.shortest_distance> but the function doesn't return the expected result. Here is my trivial try: # ------------------- import graph_tool as gt from graph_tool.topology import shortest_distance import numpy as np wedges=[(2, 0, 6.0), (0, 3, 7.0), (0, 2, 2.0)] print(wedges) # Définition of the weighted graph g= gt.Graph(directed=True) weight = g.new_edge_property("double") g.add_edge_list(np.array(wedges), eprops=[weight]) # Floyd call dist=shortest_distance(g, dense=True) # I'm expecting the vector distance from vertex 2 print(dist[g.vertex(2)]) # ------------------- outputting : # ------------------- [(2, 0, 6.0), (0, 3, 7.0), (0, 2, 2.0)] array([ 1, 2147483647, 0, 2], dtype=int32) # ------------------- This not the correct distance vector from the 2-indexed node nor the correct predecessor vector. And I don't understand why I get an int32 vector since the weights have double type. Can somebody please correct my code in order to get the correct distances? Pascal -- Sent from: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/ _______________________________________________ graph-tool mailing list graph-tool@skewed.de https://lists.skewed.de/mailman/listinfo/graph-tool
