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| 2017-12-23 05:39:20 +0200 | commented answer | shortest path This is really helpful, just a little bit more....I don't really understand the 'construct part', because it seems there's no different when I run the code with or without the 'construct part' and in Cocalc can we have a better visualization for the graph? |
| 2017-12-22 03:25:25 +0200 | commented question | shortest path so how should I write the code? |
| 2017-12-22 02:24:33 +0200 | received badge | ● Editor (source) |
| 2017-12-21 15:54:43 +0200 | asked a question | shortest path Hi, I wanna find the best route by minimizing the cost form 4a to 1a, I write this code in Cocalc G = Graph({"1a": {"2a": 521916, "22a": 182390, "23a": 144448, "44a": 1199260, "101a": 73200}, "23a": {"24a": 200324,"101a": 193980}, "2a": {"3a": 193980}, "3a": {"4a": 176900}, "4a" : {"5a":78080}, "5a" : {"6a":599386}, "6a" : {"7a":633180, "30a":845582}, "7a":{"8a":293532}, "8a":{"9a":197030, "32a":562420}, "9a":{"10a":97600}, "10a":{"17a":154940}, "9a":{"16a":342820}, "16a":{"17a":354898,"18a":164578, "15a":309880,"18a":164578}, "15a":{"14a":592920}, "18a":{"19a":147559}, "19a":{"20a":338550}, "20a":{"21a":190930}, "21a":{"7a":26230}, "32a":{"31a":207400}, "11a":{"12a":498980}, "33a":{"34a":378200}, "34a":{"35a":196176}, "30a":{"28a":200080}, "28a":{"29a":390888}, "29a":{"25a":462136}, "25a":{"26a":536800}, "2a":{"25a":183000}, "26a":{"27a":694790}, "27a":{"28a":747128}, "27a":{"41a":317200}, "41a":{"42a":451400}, "42a":{"12a":85400}, "41a":{"40a":660020}, "42a":{"44a":500566}, "12a":{"64a":231800}, "64a":{"65a":505568}, "45a":{"46a":581696}, "46a":{"47a":819352}, "47a":{"48a":486292}, "48a":{"49a":466406}, "49a":{"50a":292800}, "50a":{"51a":744200}, "51a":{"52a":256200}, "52a":{"53a":573400}, "52a":{"54a":744200}, "54a":{"55a":195200}, "55a":{"56a":689300}, "55a":{"62a":366000}, "62a":{"63a":793000}, "56a":{"57a":183000}, "57a":{"58a":149084}, "58a":{"59a":390400}, "59a":{"60a":265960}, "60a":{"61a":378810}, "66a":{"67a":504470}, "67a":{"68a":245830}, "68a":{"69a":213500}, "69a":{"70a":256200}, "67a":{"71a":833138}, "71a":{"72a":686860}, "72a":{"73a":732000}, "73a":{"74a":305000}, "74a":{"75a":207400}, "72a":{"76a":479460}, "76a":{"77a":183000}, "77a":{"78a":512400}, "71a":{"84a":131760}, "84a":{"83a":466040}, "83a":{"85a":187880}, "83a":{"82a":453840}, "82a":{"81a":376980}, "81a":{"80a":451400}, "80a":{"79a":368074}, "85a":{"86a":543266}, "86a":{"87a":513742}, "87a":{"88a":699426}, "88a":{"89a":685030}, "89a":{"90a":386130}, "89a":{"91a":451400}, "91a":{"92a":669170}, "92a":{"93a":313784}, "93a":{"94a":12.2}, "93a":{"95a":548024}, "95a":{"96a":45140}, "86a":{"97a":319640}, "36a":{"37a":31720}, "98a":{"99a":488000}, "98a":{"39a":644770}, "39a":{"43a":435906}, "49a":{"57a":399916}, "23a":{"101a":193980}, "101a":{"1a":73200}, "2a":{"25a":183000}, "23b":{"101b":82200}, "101b":{"25b":373800}, "25b":{"3b":63000}, "3b":{"4b":245400}, "4b":{"6b":202800}, "6b":{"7b":180000}, "7b":{"8b":220800}, "8b":{"13b":246000}, "23a":{"23b":250000}, "101b":{"101a":250000}, "25b":{"25a":250000}, "3b":{"3a":250000}, "4b":{"4a":250000}, "6b":{"6a":250000}, "7b":{"7a":250000}, "8b":{"8a":250000}, "13b":{"13a":250000}}) G.plot(edge_labels=True).show() # long time G.shortest_path("4a", "1a", by_weight=True) <change> I mean I wrote G.shortest_path("4a", "1a", by_weight=True) instead of G.shortest_path("3a", "2a", by_weight=True) but it gives me 4a,5a,6a,30a, 28a, 29a, 25a, 2a,1a (which is not the best route) because i try to manually calculate and there's a better route which is 4a, 3a, 2a, 1a so, why this g.shortest_path doesn't give me the shortest one? n btw what's the command to print/show the total cost of the chosen shortest path? Thanks, Astra Ps. I'm new to sagemath |
Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.