The basic principles of heuristic queue notation and its applications in calculation of matrix and topological index for topological graphs
Qian Hu · Jisuanji yu yingyong huaxue · 2003
The heuristic queue notation (H. Q. N. ) method for coding topological structure, combing the advantages of both the connection table and the linear notation method, is proposed. In the HQN method, the atoms are represented by the symbols of the element table, with the first capitalized letter and the second small letter (if exits). The bonds are denoted by the pair( s) of the labels of the atoms, in which simple bond is expressed as one pair of the two labels on the edge, and multiple bond are applied by the multiple times of the pair of the two labels on the edge. For molecule, the heuristic queue notation is coded sequentially by the pairs of labels of the atoms on the bonds, with the atom types (not carbon atom) following the labels, which is the origin of why the method is called as heuristic queue notation. Under the Matlab environment, the HQN codes are transferred to calculate 8 matrices, and 26 kinds of indices with more than 300 topological indices.