Class PetitjeanNumberDescriptor

All Implemented Interfaces:
IDescriptor, IMolecularDescriptor

public class PetitjeanNumberDescriptor extends AbstractMolecularDescriptor implements IMolecularDescriptor
According to the Petitjean definition, the eccentricity of a vertex corresponds to the distance from that vertex to the most remote vertex in the graph. The distance is obtained from the distance matrix as the count of edges between the two vertices. If r(i) is the largest matrix entry in row i of the distance matrix D, then the radius is defined as the smallest of the r(i). The graph diameter D is defined as the largest vertex eccentricity in the graph. (
Parameters for this descriptor:
Name Default Description
no parameters
Returns a single value named PetitjeanNumber.
Dictionary pointer(s):
petitjeanNumber in the Descriptors Dictionary [qsar-descriptors:petitjeanNumber]
Source code:
Belongs to CDK module:
Petit-Jean, number
Created on:
December 7, 2004, 2004-11-03
  • Constructor Details

    • PetitjeanNumberDescriptor

      public PetitjeanNumberDescriptor()
      Constructor for the PetitjeanNumberDescriptor object
  • Method Details

    • getSpecification

      public DescriptorSpecification getSpecification()
      Gets the specification attribute of the PetitjeanNumberDescriptor object
      Specified by:
      getSpecification in interface IDescriptor
      The specification value
    • setParameters

      public void setParameters(Object[] params) throws CDKException
      Sets the parameters attribute of the PetitjeanNumberDescriptor object
      Specified by:
      setParameters in interface IDescriptor
      params - The new parameters value
      CDKException - Description of the Exception
      See Also:
    • getParameters

      public Object[] getParameters()
      Gets the parameters attribute of the PetitjeanNumberDescriptor object
      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 atomContainer)
      Evaluate the descriptor for the molecule.
      Specified by:
      calculate in interface IMolecularDescriptor
      atomContainer - AtomContainer
      petitjean number
    • 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 PetitjeanNumberDescriptor object
      Specified by:
      getParameterNames in interface IDescriptor
      The parameterNames value
    • getParameterType

      public Object getParameterType(String name)
      Gets the parameterType attribute of the PetitjeanNumberDescriptor object
      Specified by:
      getParameterType in interface IDescriptor
      name - Description of the Parameter
      The parameterType value
    • initialise

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