Re: [jgrapht-users] Edge weights

[<fee...@gm...>]

Thank you guys for your replies… I’ve made some changes in my simple code taking into account your advice…..however I’m still getting this error:

Exception in thread "main" java.lang.IllegalArgumentException: loops not allowed
ÏÏ§Ï        at org.jgrapht.graph.AbstractBaseGraph.addEdge(AbstractBaseGraph.java:243)
ÏÏ§Ï        at org.jgrapht.Graphs.addEdge(Graphs.java:88)
ÏÏ§Ï        at JGraphTestDirected.main(JGraphTestDirected.java:77)


My plan is simple…take a matrix with weights…….two for loops to go through it for creating edges and adding weights.


any help will be appreciated.


Phil



> On 1/07/2015, at 7:26 pm, Joris Kinable <de...@gm...> wrote:
> 
> Three ways to add weighted edges:
> 
> 1. Use the graph itself:
> DefaultWeightedEdge e=graph.addEdge(V vertex1, V vertex2);
> graph.setEdgeWeight(e, double weight);
> 
> 2. Use one of the following methods in the Graphs package:
> Graphs.addAllEdges(Graph<? super V,? super E> destination, Graph<V,E> source, Collection<? extends E> edges)
> Graphs.addEdge(Graph<V,E> g, V sourceVertex, V targetVertex, double weight)
> Graphs.addEdgeWithVertices(Graph<V,E> targetGraph, Graph<V,E> sourceGraph, E edge, double weight)
> 
> 3. Use the Graph Builder which was added to the latest version of jgrapht:
> SimpleWeightedGraph<String, DefaultWeightedEdge> builtWeightedGraph =
>         SimpleWeightedGraph.<String, DefaultWeightedEdge>
>         builder(DefaultWeightedEdge.class)
>         .addEdge(v1, v2, 1.0)
>         .addEdge(v1, v2, 2.0)
>         .addEdge(v3, v4, 3.0)
>         .addEdge(v2, v4, 2.0)
>         .build();
> 
> 
> br,
> 
> Joris Kinable
> 
> On Wed, Jul 1, 2015 at 7:13 PM, Rushang Karia <rus...@ho... <mailto:rus...@ho...>> wrote:
> I am at work right now and do not remember if such a function exists (not worked on weighted graphs a lot). I guess there should be such a function since your problem is quite intuitive.
> 
> However,
> If no such function exists then you could overload the addEdge() to specify a weight for the WeightedGraph.
> The function would be
> 
> DefaultWeightedEdge  <V, E> addEdge(V v1, V v2, E weight)
> {
>         DefaultWeightedEdge e1 = super.addEdge(v1, v2);
>         this.setEdgeWeight(e1, weight)
>         If(error) return null else return the edge.
> }
> 
> I am sorry if my reply is brief but I am a bit busy right now. If you need more detailed instructions feel free to reply.
> 
> -----Original Message-----
> From: fee...@gm... <mailto:fee...@gm...> [mailto:fee...@gm... <mailto:fee...@gm...>]
> Sent: Wednesday, July 01, 2015 4:05 PM
> To: jgr...@li... <mailto:jgr...@li...>
> Subject: [jgrapht-users] Edge weights
> 
> Hi there,
> 
> I’m a newbie using Jgrapht… .My problem  has to do with a large weighted graph (about 2000 edges)   and the assignation of its weights.
> 
> All I wanna ask is whether or not weights for a graph can be assigned dynamically  (a loop) rather than static (one by on)...like:
> 
> DefaultWeightedEdge e1 = graph.addEdge("vertex1", "vertex2”); graph.setEdgeWeight(e1, 5);
> 
> (I’d have to write this thousand times…. )
> 
> 
> Thanks.
> 
> Phil
> 
> 
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