An Introduction to Graphviz via R. Kelly’s “Trapped in the Closet” Hip Hopera : Rob's Blog
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Web site excerpt: DSL to draw graphs. Very good for showing off research or analytical results. Its easy to write a little ruby app which generates the input to graphviz
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Link to site: An Introduction to Graphviz via R. Kelly’s “Trapped in the Closet” Hip Hopera : Rob's Blog