It is necessary to explain quickly how the user feedback led us to the specific orientation of ForceAtlas2 (a continuous algorithm). This paper focuses more on how classical techniques fit together in the perspective of a rich user experience - and which techniques do not. Our contribution to the mathematics of network spatialization is limited to the benchmark of a specific implementation of adaptive speed (step length selection).
This is also why ForceAtlas2 is more about usability than originality.
#Satisfactory layouts software#
This is why it looks so different to a software like Pajek. If developing an algorithm is “research” and implementing it is “engineering”, then a specificity of Gephi overall, is that it is based in engineering rather than in research. To the researchers or engineers interested in the development of spatialization algorithms, we offer a discussion of our choices of features and implementation. To Gephi users, we offer a complete description of the ForceAtlas2 algorithm and its settings. This paper addresses two different audiences. We also explain why we integrated its various features and discuss our design choices.
We propose a benchmark for our compromise between performance and quality. We lay out its complete functioning for the users who need a precise understanding of its behaviour, from the formulas to graphic illustration of the result. The algorithm benefits from much feedback and is developed in order to provide many possibilities through its settings. It is designed for the Gephi user experience (it is a continuous algorithm), and we explain which constraints it implies. We do not claim a theoretical advance but an attempt to integrate different techniques such as the Barnes Hut simulation, degree-dependent repulsive force, and local and global adaptive temperatures. ForceAtlas2 is a force-directed layout close to other algorithms used for network spatialization. We present here for the first time its functioning and settings. The latter is developed by the Gephi team as an all-around solution to Gephi users’ typical networks (scale-free, 10 to 10,000 nodes). One of its key features is the ability to display the spatialization process, aiming at transforming the network into a map, and ForceAtlas2 is its default layout algorithm.
Gephi is a network visualization software used in various disciplines (social network analysis, biology, genomics…).
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