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Class weka.filters.EmptyAttributeFilter

java.lang.Object
    |
    +----weka.filters.Filter
            |
            +----weka.filters.EmptyAttributeFilter

public class EmptyAttributeFilter
extends Filter
Removes all attributes that do not contain more than one distinct value. This determination is made based on the first batch of instances seen. If an attribute contains one distinct value and missing values, this is still taken as being empty.

Version:
$Revision: 1.7 $
Author:
Stuart Inglis (stuart@intelligenesis.net)

Constructor Index

 o EmptyAttributeFilter()
 

Method Index

 o batchFinished()
Signify that this batch of input to the filter is finished.
 o input(Instance)
Input an instance for filtering.
 o main(String[])
Main method for testing this class.
 o setInputFormat(Instances)
Sets the format of the input instances.

Constructor Detail

 o EmptyAttributeFilter
public EmptyAttributeFilter()

Method Detail

 o setInputFormat
public boolean setInputFormat(Instances instanceInfo) throws java.lang.Exception
          Sets the format of the input instances.
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
Overrides:
setInputFormat in class Filter
 o input
public boolean input(Instance instance)
          Input an instance for filtering. Filter requires all training instances be read before producing output.
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 defined.
Overrides:
input in class Filter
 o 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.
Returns:
true if there are instances pending output
Throws:
java.lang.IllegalStateException - if no input structure has been defined
Overrides:
batchFinished in class Filter
 o 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

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