Package weka.filters.unsupervised.attribute

Class Reorder

java.lang.Object
weka.filters.Filter
weka.filters.unsupervised.attribute.Reorder
All Implemented Interfaces:
Serializable, CapabilitiesHandler, CapabilitiesIgnorer, CommandlineRunnable, OptionHandler, RevisionHandler, WeightedAttributesHandler, WeightedInstancesHandler, StreamableFilter, UnsupervisedFilter
public class Reorder extends Filter implements UnsupervisedFilter, StreamableFilter, OptionHandler, WeightedAttributesHandler, WeightedInstancesHandler
A filter that generates output with a new order of the attributes. Useful if one wants to move an attribute to the end of the list of attributes to use it as class attribute (e.g., using "-R 2-last,1").

It is not only possible to change the order of the attributes. Attributes can also be left out. 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., using 1,1,1,4,4,4,2,2,2 if one needs to process two copies of the attributes with other filters but also needs to keep the original attributes.

One can simply reverse the order of the attributes via 'last-first'.

After applying the filter, the index of the class attribute is set to the index of the last attribute.

Valid options are: 

 -R <index1,index2-index4,...>
  Specifies the order of the attributes (default first-last).
Version:
$Revision: 14605 $
Author:
FracPete (fracpete at waikato dot ac dot nz)
See Also:

  • Constructor Details

    • Reorder

      public Reorder()

  • Method Details

    • listOptions

      public Enumeration<Option> listOptions()
      Returns an enumeration describing the available options.
      Specified by:
      listOptions in interface OptionHandler
      Overrides:
      listOptions in class Filter
      Returns:
      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,...>
  Specifies the order of the attributes (default first-last).
      Specified by:
      setOptions in interface OptionHandler
      Overrides:
      setOptions in class Filter
      Parameters:
      options - the list of options as an array of strings
      Throws:
      Exception - if an option is not supported

    • getOptions

      public String[] getOptions()
      Gets the current settings of the filter.
      Specified by:
      getOptions in interface OptionHandler
      Overrides:
      getOptions in class Filter
      Returns:
      an array of strings suitable for passing to setOptions

    • getCapabilities

      public Capabilities getCapabilities()
      Returns the Capabilities of this filter.
      Specified by:
      getCapabilities in interface CapabilitiesHandler
      Overrides:
      getCapabilities in class Filter
      Returns:
      the capabilities of this object
      See Also:

    • setInputFormat

      public boolean setInputFormat(Instances instanceInfo) throws Exception
      Sets the format of the input instances.
      Overrides:
      setInputFormat in class Filter
      Parameters:
      instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
      Returns:
      true if the outputFormat may be collected immediately
      Throws:
      Exception - if a problem occurs setting the input format

    • setAllAttributeWeightsToOne

      public void setAllAttributeWeightsToOne(boolean b)
      Whether to set all attribute weights to one in output data.

    • 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.
      Overrides:
      input in class Filter
      Parameters:
      instance - the input instance
      Returns:
      true if the filtered instance may now be collected with output().
      Throws:
      IllegalStateException - if no input format has been defined.

    • globalInfo

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

    • getAttributeIndices

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

    • attributeIndicesTipText

      public String attributeIndicesTipText()
      Returns the tip text for this property
      Returns:
      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)
      Parameters:
      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.
      Throws:
      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)
      Parameters:
      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.
      Throws:
      Exception - if an invalid set of ranges is supplied

    • getRevision

      public String getRevision()
      Returns the revision string.
      Specified by:
      getRevision in interface RevisionHandler
      Overrides:
      getRevision in class Filter
      Returns:
      the revision

    • main

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