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Working with graphs in Julia

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I was trying to create a more advanced graph plot by using `ExEdge` and `ExVertex` objects in a graph but passing them to `to_dot()` function resulted in skipping the attributes....

using Graphs warnings then WARNING: deprecated syntax "inner constructor TopologicalSortVisitor(...) around /apps/infrafs1/dbrowne/.julia/v0.6/Graphs/src/depth_first_visit.jl:131". Use "TopologicalSortVisitor{V}(...) where V" instead. WARNING: deprecated syntax "abstract AbstractMASVisitor

In my opinion, the writer's intention is printing like below. 1: 2 3 2: 1 3 3: 3 2

A function to add ExVertex (s) to GenericGraph (s) with less overheard. See pull request #236 for complementary function in common.jl

A constructor for ExEdge that takes an additional parameter is a useful extension that makes a lot of sense because the ExEdge typed is implemented *specifically* to allow the inclusion...

out_edges actually returns the edge of type E if the graph is defined over vertices of type V and edges of type E.

There are two implementation of graph implementations here. One is by incidence list, second one is by adjacent list. But, I think, this name is ambiguous. Because I found "incidence...

I'm currently using ```ExVertex.attributes["data"] = T(...)``` and would like to natively support user data types which default to ```nothing``` if unused. Any objections?

I just started using ```Graphs.jl```, but the definition of a distance matrix of a given graph ```g``` that is returned from the function ```distance_matrix(g, eweights)``` is quite unconventional and misleading....

`BoundsError` can be thrown during processing of `test_cyclic_by_dfs` if ids of edges are not in order. The error is thrown in `Graphs/src/depth_first_visit.jl:28` which is: ``` e_color = edgecolormap[edge_index(v_edge, graph)] ```...