This method calculates the distance-sum-connectivity matrix of a given graph.
a graph as a graphNEL object.
the pre-computed distance matrix of the graph. Will be calculated automatically if NULL.
This method returns the distance-sum-connectivity matrix of a given graph. This is an adjacency matrix where each edge is weighted according to the reciprocal square root of the product of the adjacent vertices' distance sum.
K. Szymanski, W. Mueller, J. Knop, and N. Trinajsti\'c. On the Identification Numbers for Chemical Structures. International Journal of Quantum Chemistry, 30(S20):173-183, 1986
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