Weighted ID number
This method calculates the weighted ID number.
a graph as a graphNEL object.
the distance-sum-connectivity matrix of g. Will be automatically calculated if not supplied.
The result is a list of two floating point numbers, the weighted ID number (WID) and the self-returning ID number (SID). The former is based on the sum of all walks weighted according to vertex distance degrees. The latter is limited to self-returning walks.
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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