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Message from discussion Using dijkstra for top N paths
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Yuval  
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 More options Oct 3 2012, 3:50 am
From: Yuval <yuvalper...@gmail.com>
Date: Wed, 3 Oct 2012 00:50:38 -0700 (PDT)
Local: Wed, Oct 3 2012 3:50 am
Subject: Re: [Neo4j] Using dijkstra for top N paths
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Do you have any idea who might be my friend?

The end result should be something similar to navigation apps where they
show you several suggested routes.

On Wednesday, October 3, 2012 9:24:17 AM UTC+2, Lasse Westh-Nielsen wrote:

> On Wed, Oct 3, 2012 at 12:20 AM, Yuval Perlov <yuval...@gmail.com<javascript:>>
> wrote:
> > Seems the idea is to traverse all possible paths... what if there are a
> lot
> > of paths?  Dijkstra allows to find the best route but not the second
> third
> > etc but all might be too complex.

> Finding the shortest path involves looking at a lot of paths - think
> about it, if you didn't, the shortest might be one of the ones you
> didn't look at. It is the nature of the problem :)

> Dijkstra in particular will find shortest paths to all reachable nodes
> using some fixed starting point. Did you need multiple paths between
> two fixed points instead? Then Dijkstra is not your friend.

>  - Lasse


 
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