Figure 18From: Gravity law in the Chinese highway freight transportation networksEvolution of the exponents of daily directed and undirected freight highway transportation networks. (a) Scatter data of \(F_{ij}\) with respect to \(P_{i}^{\alpha_{1}}P_{j}^{\alpha_{2}}/d_{ij}^{\alpha_{3}}\) for the directed network. (b) Binning data of \(F_{ij}\) with respect to \(P_{i}^{\alpha_{1}}P_{j}^{\alpha_{2}}/d_{ij}^{\alpha_{3}}\) for the directed network. (c) Scatter data of \(W_{ij}\) with respect to \(P_{i}^{\alpha _{1}}P_{j}^{\alpha_{2}}/d_{ij}^{\alpha_{3}}\) for the undirected network. (d) Binning data of \(W_{ij}\) with respect to \(P_{i}^{\alpha_{1}}P_{j}^{\alpha _{2}}/d_{ij}^{\alpha_{3}}\) for the undirected networkBack to article page