Calculate the Kier and Hall Chi Chain Indices of Orders 3, 4, 5, 6 and 7
Parsed molucule object.
Logical. Whether the calculating process
should be shown or not, default is
Evaluates chi chain descriptors. The code currently evluates the simple and valence chi chain descriptors of orders 3, 4, 5, 6 and 7. It utilizes the graph isomorphism code of the CDK to find fragments matching SMILES strings representing the fragments corresponding to each type of chain.
A data frame, each row represents one of the molecules, each column represents one feature. This function returns 10 columns, in the following order:
SCH.3 - Simple chain, order 3
SCH.4 - Simple chain, order 4
SCH.5 - Simple chain, order 5
SCH.6 - Simple chain, order 6
SCH.7 - Simple chain, order 7
VCH.3 - Valence chain, order 3
VCH.4 - Valence chain, order 4
VCH.5 - Valence chain, order 5
VCH.6 - Valence chain, order 6
VCH.7 - Valence chain, order 7
These descriptors are calculated using graph isomorphism to identify the various fragments. As a result calculations may be slow. In addition, recent versions of Molconn-Z use simplified fragment definitions (i.e., rings without branches etc.) whereas these descriptors use the older more complex fragment definitions.
Nan Xiao <https://nanx.me>
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