类 FirstOrder

java.lang.Object
weka.filters.Filter
weka.filters.unsupervised.attribute.FirstOrder
所有已实现的接口:
Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, StreamableFilter, UnsupervisedFilter

public class FirstOrder extends Filter implements UnsupervisedFilter, StreamableFilter, OptionHandler
This instance filter takes a range of N numeric attributes and replaces them with N-1 numeric attributes, the values of which are the difference between consecutive attribute values from the original instance. eg:

Original attribute values

0.1, 0.2, 0.3, 0.1, 0.3

New attribute values

0.1, 0.1, -0.2, 0.2

The range of attributes used is taken in numeric order. That is, a range spec of 7-11,3-5 will use the attribute ordering 3,4,5,7,8,9,10,11 for the differences, NOT 7,8,9,10,11,3,4,5.

Valid options are:

 -R <index1,index2-index4,...>
  Specify list of columns to take the differences between.
  First and last are valid indexes.
  (default none)
版本:
$Revision: 5543 $
作者:
Len Trigg (trigg@cs.waikato.ac.nz)
另请参阅:
  • 构造器详细资料

    • FirstOrder

      public FirstOrder()
  • 方法详细资料

    • globalInfo

      public String globalInfo()
      Returns a string describing this filter
      返回:
      a description of the filter suitable for displaying in the explorer/experimenter gui
    • listOptions

      public Enumeration listOptions()
      Returns an enumeration describing the available options.
      指定者:
      listOptions 在接口中 OptionHandler
      返回:
      an enumeration of all the available options.
    • setOptions

      public void setOptions(String[] options) throws Exception
      Parses a given list of options.

      Valid options are:

       -R <index1,index2-index4,...>
        Specify list of columns to take the differences between.
        First and last are valid indexes.
        (default none)
      指定者:
      setOptions 在接口中 OptionHandler
      参数:
      options - the list of options as an array of strings
      抛出:
      Exception - if an option is not supported
    • getOptions

      public String[] getOptions()
      Gets the current settings of the filter.
      指定者:
      getOptions 在接口中 OptionHandler
      返回:
      an array of strings suitable for passing to setOptions
    • getCapabilities

      public Capabilities getCapabilities()
      Returns the Capabilities of this filter.
      指定者:
      getCapabilities 在接口中 CapabilitiesHandler
      覆盖:
      getCapabilities 在类中 Filter
      返回:
      the capabilities of this object
      另请参阅:
    • setInputFormat

      public boolean setInputFormat(Instances instanceInfo) throws Exception
      Sets the format of the input instances.
      覆盖:
      setInputFormat 在类中 Filter
      参数:
      instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
      返回:
      true if the outputFormat may be collected immediately
      抛出:
      UnsupportedAttributeTypeException - if any of the selected attributes are not numeric
      Exception - if only one attribute has been selected.
    • input

      public boolean input(Instance instance)
      Input an instance for filtering. Ordinarily the instance is processed and made available for output immediately. Some filters require all instances be read before producing output.
      覆盖:
      input 在类中 Filter
      参数:
      instance - the input instance
      返回:
      true if the filtered instance may now be collected with output().
      抛出:
      IllegalStateException - if no input format has been defined.
    • attributeIndicesTipText

      public String attributeIndicesTipText()
      Returns the tip text for this property
      返回:
      tip text for this property suitable for displaying in the explorer/experimenter gui
    • getAttributeIndices

      public String getAttributeIndices()
      Get the current range selection
      返回:
      a string containing a comma separated list of ranges
    • setAttributeIndices

      public void setAttributeIndices(String rangeList) throws Exception
      Set which attributes are to be deleted (or kept if invert is true)
      参数:
      rangeList - a string representing the list of attributes. Since the string will typically come from a user, attributes are indexed from 1.
      eg: first-3,5,6-last
      抛出:
      Exception - if an invalid range list is supplied
    • setAttributeIndicesArray

      public void setAttributeIndicesArray(int[] attributes) throws Exception
      Set which attributes are to be deleted (or kept if invert is true)
      参数:
      attributes - an array containing indexes of attributes to select. Since the array will typically come from a program, attributes are indexed from 0.
      抛出:
      Exception - if an invalid set of ranges is supplied
    • getRevision

      public String getRevision()
      Returns the revision string.
      指定者:
      getRevision 在接口中 RevisionHandler
      覆盖:
      getRevision 在类中 Filter
      返回:
      the revision
    • main

      public static void main(String[] argv)
      Main method for testing this class.
      参数:
      argv - should contain arguments to the filter: use -h for help