类 MathExpression

所有已实现的接口:
Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, UnsupervisedFilter

public class MathExpression extends PotentialClassIgnorer implements UnsupervisedFilter
Modify numeric attributes according to a given expression

Valid options are:

 -unset-class-temporarily
  Unsets the class index temporarily before the filter is
  applied to the data.
  (default: no)
 -E <expression>
  Specify the expression to apply. Eg. pow(A,6)/(MEAN+MAX)
  Supported operators are +, -, *, /, pow, log,
  abs, cos, exp, sqrt, tan, sin, ceil, floor, rint, (, ), 
  MEAN, MAX, MIN, SD, COUNT, SUM, SUMSQUARED, ifelse
 -R <index1,index2-index4,...>
  Specify list of columns to ignore. First and last are valid
  indexes. (default none)
 -V
  Invert matching sense (i.e. only modify specified columns)
版本:
$Revision: 5543 $
作者:
Eibe Frank (eibe@cs.waikato.ac.nz), Prados Julien (julien.prados@cui.unige.ch)
另请参阅:
  • 字段详细资料

    • m_defaultExpression

      public static final String m_defaultExpression
      The default modification expression
      另请参阅:
  • 构造器详细资料

    • MathExpression

      public MathExpression()
      Constructor
  • 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
    • 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 PotentialClassIgnorer
      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 the input format can't be set successfully
    • input

      public boolean input(Instance instance) throws Exception
      Input an instance for filtering. Filter requires all training 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 set.
      NullPointerException - if the input format has not been defined.
      Exception - if the input instance was not of the correct format or if there was a problem with the filtering.
    • batchFinished

      public boolean batchFinished() throws Exception
      Signify that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances.
      覆盖:
      batchFinished 在类中 Filter
      返回:
      true if there are instances pending output
      抛出:
      IllegalStateException - if no input structure has been defined
      NullPointerException - if no input structure has been defined,
      Exception - if there was a problem finishing the batch.
    • setOptions

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

      Valid options are:

       -unset-class-temporarily
        Unsets the class index temporarily before the filter is
        applied to the data.
        (default: no)
       -E <expression>
        Specify the expression to apply. Eg. pow(A,6)/(MEAN+MAX)
        Supported operators are +, -, *, /, pow, log,
        abs, cos, exp, sqrt, tan, sin, ceil, floor, rint, (, ), 
        MEAN, MAX, MIN, SD, COUNT, SUM, SUMSQUARED, ifelse
       -R <index1,index2-index4,...>
        Specify list of columns to ignore. First and last are valid
        indexes. (default none)
       -V
        Invert matching sense (i.e. only modify specified columns)
      指定者:
      setOptions 在接口中 OptionHandler
      覆盖:
      setOptions 在类中 PotentialClassIgnorer
      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
      覆盖:
      getOptions 在类中 PotentialClassIgnorer
      返回:
      an array of strings suitable for passing to setOptions
    • listOptions

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

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

      public void setExpression(String expr)
      Set the expression to apply
      参数:
      expr - a mathematical expression to apply
    • getExpression

      public String getExpression()
      Get the expression
      返回:
      the expression
    • invertSelectionTipText

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

      public boolean getInvertSelection()
      Get whether the supplied columns are to be select or unselect
      返回:
      true if the supplied columns will be kept
    • setInvertSelection

      public void setInvertSelection(boolean invert)
      Set whether selected columns should be select or unselect. If true the selected columns are modified. If false the selected columns are not modified.
      参数:
      invert - the new invert setting
    • ignoreRangeTipText

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

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

      public void setIgnoreRange(String rangeList)
      Set which attributes are to be ignored
      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
    • 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