This method calculates the Randi\'c connectivity ID number.
a graph as a graphNEL object.
the degree of each node of g. Will be automatically calculated if not supplied.
The resulting floating point value is a weighted path sum which stresses local features and takes the vertex degree into account.
M. Randic. On Molecular Identification Numbers. Journal of Chemical Information and Computer Sciences, 24(3):164-175, 1984
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