java.lang.Object
- weka.filters.Filter
- - weka.filters.unsupervised.attribute.PotentialClassIgnorer
  - - weka.filters.unsupervised.attribute.ReplaceMissingValues

All Implemented Interfaces:

java.io.Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, Sourcable, UnsupervisedFilter
```
public class ReplaceMissingValues
extends PotentialClassIgnorer
implements UnsupervisedFilter, Sourcable
```
Replaces all missing values for nominal and numeric attributes in a dataset with the modes and means from the training data.
Valid options are:
```
 -unset-class-temporarily
  Unsets the class index temporarily before the filter is
  applied to the data.
  (default: no)
```
Version:

$Revision: 5547 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

ReplaceMissingValues()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`batchFinished()`	Signify that this batch of input to the filter is finished.
`Capabilities`	`getCapabilities()`	Returns the Capabilities of this filter.
`java.lang.String`	`getRevision()`	Returns the revision string.
`java.lang.String`	`globalInfo()`	Returns a string describing this filter
`boolean`	`input(Instance instance)`	Input an instance for filtering.
`static void`	`main(java.lang.String[] argv)`	Main method for testing this class.
`boolean`	`setInputFormat(Instances instanceInfo)`	Sets the format of the input instances.
`java.lang.String`	`toSource(java.lang.String className, Instances data)`	Returns a string that describes the filter as source.

Methods inherited from class weka.filters.unsupervised.attribute.PotentialClassIgnorer
getIgnoreClass, getOptions, getOutputFormat, ignoreClassTipText, listOptions, setIgnoreClass, setOptions

Methods inherited from class weka.filters.Filter
batchFilterFile, filterFile, getCapabilities, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, numPendingOutput, output, outputPeek, toString, useFilter, wekaStaticWrapper

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ReplaceMissingValues
```
public ReplaceMissingValues()
```
- Method Detail
  - globalInfo
```
public java.lang.String globalInfo()
```
    Returns a string describing this filter
    
    Returns:
    
    a description of the filter suitable for displaying in the explorer/experimenter gui
  - 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:
    
    Capabilities
  - setInputFormat
```
public boolean setInputFormat(Instances instanceInfo)
                       throws java.lang.Exception
```
    Sets the format of the input instances.
    
    Overrides:
    
    setInputFormat in class PotentialClassIgnorer
    
    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:
    
    java.lang.Exception - if the input format can't be set successfully
  - input
```
public boolean input(Instance instance)
```
    Input an instance for filtering. Filter requires all training 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:
    
    java.lang.IllegalStateException - if no input format has been set.
  - batchFinished
```
public boolean batchFinished()
```
    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.
    
    Overrides:
    
    batchFinished in class Filter
    
    Returns:
    
    true if there are instances pending output
    
    Throws:
    
    java.lang.IllegalStateException - if no input structure has been defined
  - toSource
```
public java.lang.String toSource(java.lang.String className,
                                 Instances data)
                          throws java.lang.Exception
```
    Returns a string that describes the filter as source. The filter will be contained in a class with the given name (there may be auxiliary classes), and will contain two methods with these signatures:
    // converts one row public static Object[] filter(Object[] i); // converts a full dataset (first dimension is row index) public static Object[][] filter(Object[][] i);
    where the array i contains elements that are either Double, String, with missing values represented as null. The generated code is public domain and comes with no warranty.
    Specified by:
    
    toSource in interface Sourcable
    
    Parameters:
    
    className - the name that should be given to the source class.
    
    data - the dataset used for initializing the filter
    
    Returns:
    
    the object source described by a string
    
    Throws:
    
    java.lang.Exception - if the source can't be computed
  - getRevision
```
public java.lang.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(java.lang.String[] argv)
```
    Main method for testing this class.
    
    Parameters:
    
    argv - should contain arguments to the filter: use -h for help

Class ReplaceMissingValues

Constructor Summary

Method Summary

Methods inherited from class weka.filters.unsupervised.attribute.PotentialClassIgnorer

Methods inherited from class weka.filters.Filter

Methods inherited from class java.lang.Object

Constructor Detail

ReplaceMissingValues

Method Detail

globalInfo

getCapabilities

setInputFormat

input

batchFinished

toSource

getRevision

main