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## weka.filters.unsupervised.instance
Class NonSparseToSparse

    java.lang.Object
      weka.filters.Filter
          weka.filters.unsupervised.instance.NonSparseToSparse

All Implemented Interfaces:
  java.io.Serializable, StreamableFilter, UnsupervisedFilter

    public class NonSparseToSparse

extends Filter
implements UnsupervisedFilter, StreamableFilter

A filter that converts all incoming instances into sparse format.

Version:
  $Revision: 1.1 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`NonSparseToSparse()`

Method Summary
`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.

Methods inherited from class weka.filters.Filter
`batchFilterFile, batchFinished, filterFile, getOutputFormat, inputFormat, isOutputFormatDefined, numPendingOutput, output, outputFormat, outputPeek, useFilter`

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

Constructor Detail

### NonSparseToSparse

    public NonSparseToSparse()

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

### setInputFormat

    public boolean setInputFormat(Instances instanceInfo)
                           throws java.lang.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:
    `java.lang.Exception` - if the inputFormat can't be set successfully

### 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:
    `java.lang.IllegalStateException` - if no input format has been set.

### 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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