Node Degree Sequence Preserving and Controlling S-metric

We study edge switching on node degree preserving and their effects on s-metric. In particular, we proposed Smax and Smin algorithms in a network. The concept of edge switching pairs is defined and used in the design of node degree preserving, constant, increasing (decreasing) s-metric link transformations. And the s(G) can be turned between s_minand s_max by the edge switching algorithm.