Constrained Stress Majorization Using Diagonally Scaled Gradient Projection
Dwyer, Tim and Marriott, Kim (2008) Constrained Stress Majorization Using Diagonally Scaled Gradient Projection. In: Graph Drawing 15th International Symposium, GD 2007, September 24-26, 2007, Sydney, Australia , pp. 219-230 (Official URL: http://dx.doi.org/10.1007/978-3-540-77537-9_23).
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Constrained stress majorization is a promising new technique for integrating application specific layout constraints into force-directed graph layout. We significantly improve the speed and convergence properties of the constrained stress-majorization technique for graph layout by employing a diagonal scaling of the stress function. Diagonal scaling requires the active-set quadratic programming solver used in the projection step to be extended to handle separation constraints with scaled variables, i.e. of the form s_i y_i + g_ij le s_j y_j. The changes, although relatively small, are quite subtle and explained in detail.
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