Re: [jgrapht-users] Edge weights

[Joris K. <de...@gm...>]

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...>
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...]
> Sent: Wednesday, July 01, 2015 4:05 PM
> To: 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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