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In Cytoscape, the Kamada & Kawai Force Directed layout algorithm is able to take negative weights between edges. Does anyone know how it's actually using the sign of these? Is it forcing everything into a positive space or does it actually use the sign somehow?

https://en.wikipedia.org/wiki/Force-directed_graph_drawing

http://manual.cytoscape.org/en/stable/Navigation_and_Layout.html#edge-weighted-spring-embedded-layout

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