Class HybridizationRatioDescriptor

All Implemented Interfaces:
IDescriptor, IMolecularDescriptor

public class HybridizationRatioDescriptor extends AbstractMolecularDescriptor implements IMolecularDescriptor
IMolecularDescriptor that reports the fraction of sp3 carbons to sp2 carbons. Note that it only considers carbon atoms and rather than use a simple ratio it reports the value of Nsp3/ (Nsp3 + Nsp2). The original form of the descriptor (i.e., simple ratio) has been used to characterize molecular complexity, especially in the are of natural products , which usually have a high value of the sp3 to sp2 ratio.
Rajarshi Guha
Dictionary pointer(s):
hybratio in the Descriptors Dictionary [qsar-descriptors:hybratio]
Source code:
Belongs to CDK module:
  • Constructor Details

    • HybridizationRatioDescriptor

      public HybridizationRatioDescriptor()
      Constructor for the HybridizationRatioDescriptor object.
  • Method Details

    • getSpecification

      public DescriptorSpecification getSpecification()
      Returns a DescriptorSpecification which specifies which descriptor is implemented by this class. Returns a IImplementationSpecification which specifies which descriptor is implemented by this class. These fields are used in the map:
      • Specification-Reference: refers to an entry in a unique dictionary
      • Implementation-Title: anything
      • Implementation-Identifier: a unique identifier for this version of this class
      • Implementation-Vendor: CDK, JOELib, or anything else
      Specified by:
      getSpecification in interface IDescriptor
      An object containing the descriptor specification
    • setParameters

      public void setParameters(Object[] params) throws CDKException
      Sets the parameters attribute of the HybridizationRatioDescriptor object.
      Specified by:
      setParameters in interface IDescriptor
      params - The new parameters value
      CDKException - if more than 1 parameter is specified or if the parameter is not of type String
      See Also:
    • getParameters

      public Object[] getParameters()
      Gets the parameters attribute of the HybridizationRatioDescriptor object. This descriptor takes no parameters
      Specified by:
      getParameters in interface IDescriptor
      The parameters value
      See Also:
    • getDescriptorNames

      public String[] getDescriptorNames()
      Description copied from interface: IDescriptor
      Returns an array of names for each descriptor value calculated. Many descriptors return multiple values. In general it is useful for the descriptor to indicate the names for each value. In many cases, these names can be as simple as X1, X2, ..., XN where X is a prefix and 1, 2, ..., N are the indices. On the other hand it is also possible to return other arbitrary names, which should be documented in the Javadocs for the descriptor (e.g., the CPSA descriptor). Note that by default if a descriptor returns a single value (such as ALOGPDescriptor the return array will have a single element
      Specified by:
      getDescriptorNames in interface IDescriptor
      An array of descriptor names, equal in length to the number of descriptor calculated..
    • calculate

      public DescriptorValue calculate(IAtomContainer container)
      Calculate sp3/sp2 hybridization ratio in the supplied IAtomContainer.
      Specified by:
      calculate in interface IMolecularDescriptor
      container - The AtomContainer for which this descriptor is to be calculated.
      The ratio of sp3 to sp2 carbons
    • getDescriptorResultType

      public IDescriptorResult getDescriptorResultType()
      Returns the specific type of the DescriptorResult object. The return value from this method really indicates what type of result will be obtained from the DescriptorValue object. Note that the same result can be achieved by interrogating the DescriptorValue object; this method allows you to do the same thing, without actually calculating the descriptor.
      Specified by:
      getDescriptorResultType in interface IMolecularDescriptor
      an object that implements the IDescriptorResult interface indicating the actual type of values returned by the descriptor in the DescriptorValue object
    • getParameterNames

      public String[] getParameterNames()
      Gets the parameterNames attribute of the HybridizationRatioDescriptor object. This descriptor takes no parameters
      Specified by:
      getParameterNames in interface IDescriptor
      The parameterNames value
    • getParameterType

      public Object getParameterType(String name)
      Gets the parameterType attribute of the HybridizationRatioDescriptor object. This descriptor takes no parameters
      Specified by:
      getParameterType in interface IDescriptor
      name - the parameter name
      An Object whose class is that of the parameter requested
    • initialise

      public void initialise(IChemObjectBuilder builder)
      Default implementation of initialise allows optional override.
      Specified by:
      initialise in interface IDescriptor
      builder - chem object build