类 Reorder

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

public class Reorder extends Filter implements UnsupervisedFilter, StreamableFilter, OptionHandler
A filter that generates output with a new order of the attributes. Useful if one wants to move an attribute to the end to use it as class attribute (e.g. with using "-R 2-last,1").
But it's not only possible to change the order of all the attributes, but also to leave out attributes. E.g. if you have 10 attributes, you can generate the following output order: 1,3,5,7,9,10 or 10,1-5.
You can also duplicate attributes, e.g. for further processing later on: e.g. 1,1,1,4,4,4,2,2,2 where the second and the third column of each attribute are processed differently and the first one, i.e. the original one is kept.
One can simply inverse the order of the attributes via 'last-first'.
After appyling the filter, the index of the class attribute is the last attribute.

Valid options are:

 -R <index1,index2-index4,...>
  Specify list of columns to copy. First and last are valid
  indexes. (default first-last)
版本:
$Revision: 6249 $
作者:
FracPete (fracpete at waikato dot ac dot nz)
另请参阅:
  • 构造器详细资料

    • Reorder

      public Reorder()
  • 方法详细资料

    • 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 copy. First and last are valid
        indexes. (default first-last)
      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:
      Exception - if a problem occurs setting the input format
    • 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.
    • 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
    • getAttributeIndices

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

      public void setAttributeIndices(String rangeList) throws Exception
      Set which attributes are to be copied (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
      Note: use this method before you call setInputFormat(Instances), since the output format is determined in that method.
      抛出:
      Exception - if an invalid range list is supplied
    • setAttributeIndicesArray

      public void setAttributeIndicesArray(int[] attributes) throws Exception
      Set which attributes are to be copied (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.
      Note: use this method before you call setInputFormat(Instances), since the output format is determined in that method.
      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