# Good programs for drawing graphs ( directed weighted graphs )

Hi, does anyone know of a good program for drawing directed weighted graphs?

Thanks

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What do you mean by "drawing weighted graphs"? That is, what is the significance of the weights? Edge labels? –  Igor Rivin Feb 12 '11 at 14:46
Question is imprecise: does the OP want a program that will produce an automatically generated pleasing layout of a graph on the screen? Or a program to interactively manipulate a displayed graph? Or a program to create a diagram for inclusion in a published paper when the actual layout is already known? –  Gordon Royle Dec 17 '11 at 2:23

Try Sage - it's open source and can draw weighted directed graphs. For example:

A = random_matrix(ZZ,6, density=0.5)
G = DiGraph(A, format='weighted_adjacency_matrix')  # graph from matrix
H = G.plot(edge_labels=True, graph_border=True)
H.show()             # display on screen
H.save('graph.pdf')  # save plot to vector pdf for inclusion in a paper

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By the way, Sage uses NetworkX, which was mentioned in another answer. –  William Stein Feb 12 '11 at 18:43
You can also use NetworkX directly within Sage to have more control over your plotting options. (Sage's Graph class is a wrapper which hides a lot of functionality and is not compatible with the advanced plotting tools.) –  Derrick Stolee Feb 13 '11 at 14:44

Try Graphviz - it's open source and quite flexible as far as usage is concerned.

http://www.graphviz.org/

It's good at automatic layouts etc, where for example Maple would make a mess of things.

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Check out PGF/tikZ, which is freely available, and interacts extremely well with TeX and LaTeX.

You can find examples here, examples of graphs here, and a nice manual here.

A nice feature of the examples web page is that you can click on each example to get access to the code, which you can then copy-and-paste into your own LaTeX file, and then modify for your own purposes.

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To supplement William Stein's useful answer, here is a graph produced by running the code he displays:

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Mathematica is quite good these days and exports in a bazillion formats.

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Yup. It makes a great, and often successful, effort at picking an embedding showing relevant features. –  Mariano Suárez-Alvarez Feb 13 '11 at 1:36

you can use $newgraph-1.1.3$ for drawing and analysis every graphs. It is very good free software.

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Very simple, and easy to use for small graphs: GraphThing. It is in Ubuntu repositories. Here is home page: http://graph.seul.org/ It even computes some simple parameters.

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