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<A NAME="inputFormat(weka.core.Instances)"><!-- --></A><H3>
inputFormat</H3>
<PRE>
public boolean <B>inputFormat</B>(<A HREF="../../weka/core/Instances.html">Instances</A>&nbsp;instanceInfo)
                    throws java.lang.Exception</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>use <code>setInputFormat(Instances)</code> instead.</I>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="setInputFormat(weka.core.Instances)"><!-- --></A><H3>
setInputFormat</H3>
<PRE>
public boolean <B>setInputFormat</B>(<A HREF="../../weka/core/Instances.html">Instances</A>&nbsp;instanceInfo)
                       throws java.lang.Exception</PRE>
<DL>
<DD>Sets the format of the input instances. If the filter is able to
 determine the output format before seeing any input instances, it
 does so here. This default implementation clears the output format
 and output queue, and the new batch flag is set. Overriders should
 call <code>super.setInputFormat(Instances)</code><DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instanceInfo</CODE> - an Instances object containing the input instance
 structure (any instances contained in the object are ignored - only the
 structure is required).<DT><B>Returns:</B><DD>true if the outputFormat may be collected immediately<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if the inputFormat can't be set successfully</DL>
</DD>
</DL>
<HR>

<A NAME="outputFormat()"><!-- --></A><H3>
outputFormat</H3>
<PRE>
public final <A HREF="../../weka/core/Instances.html">Instances</A> <B>outputFormat</B>()</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>use <code>getOutputFormat()</code> instead.</I>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getOutputFormat()"><!-- --></A><H3>
getOutputFormat</H3>
<PRE>
public final <A HREF="../../weka/core/Instances.html">Instances</A> <B>getOutputFormat</B>()</PRE>
<DL>
<DD>Gets the format of the output instances. This should only be called
 after input() or batchFinished() has returned true. The relation
 name of the output instances should be changed to reflect the
 action of the filter (eg: add the filter name and options).<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an Instances object containing the output instance
 structure only.<DT><B>Throws:</B><DD><CODE>NullPointerException</CODE> - if no input structure has been
 defined (or the output format hasn't been determined yet)</DL>
</DD>
</DL>
<HR>

<A NAME="input(weka.core.Instance)"><!-- --></A><H3>
input</H3>
<PRE>
public boolean <B>input</B>(<A HREF="../../weka/core/Instance.html">Instance</A>&nbsp;instance)
              throws java.lang.Exception</PRE>
<DL>
<DD>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, in which
 case output instances should be collected after calling
 batchFinished(). If the input marks the start of a new batch, the
 output queue is cleared. This default implementation assumes all
 instance conversion will occur when batchFinished() is called.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the input instance<DT><B>Returns:</B><DD>true if the filtered instance may now be
 collected with output().<DT><B>Throws:</B><DD><CODE>NullPointerException</CODE> - if the input format has not been
 defined.<DD><CODE>java.lang.Exception</CODE> - if the input instance was not of the correct 
 format or if there was a problem with the filtering.</DL>
</DD>
</DL>
<HR>

<A NAME="batchFinished()"><!-- --></A><H3>
batchFinished</H3>
<PRE>
public boolean <B>batchFinished</B>()
                      throws java.lang.Exception</PRE>
<DL>
<DD>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. Any
 subsequent instances filtered should be filtered based on setting
 obtained from the first batch (unless the inputFormat has been
 re-assigned or new options have been set). This default
 implementation assumes all instance processing occurs during
 inputFormat() and input().<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if there are instances pending output<DT><B>Throws:</B><DD><CODE>NullPointerException</CODE> - if no input structure has been defined,<DD><CODE>java.lang.Exception</CODE> - if there was a problem finishing the batch.</DL>
</DD>
</DL>
<HR>

<A NAME="output()"><!-- --></A><H3>
output</H3>
<PRE>
public <A HREF="../../weka/core/Instance.html">Instance</A> <B>output</B>()</PRE>
<DL>
<DD>Output an instance after filtering and remove from the output queue.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the instance that has most recently been filtered (or null if
 the queue is empty).<DT><B>Throws:</B><DD><CODE>NullPointerException</CODE> - if no output structure has been defined</DL>
</DD>
</DL>
<HR>

<A NAME="outputPeek()"><!-- --></A><H3>
outputPeek</H3>
<PRE>
public <A HREF="../../weka/core/Instance.html">Instance</A> <B>outputPeek</B>()</PRE>
<DL>
<DD>Output an instance after filtering but do not remove from the
 output queue.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the instance that has most recently been filtered (or null if
 the queue is empty).<DT><B>Throws:</B><DD><CODE>NullPointerException</CODE> - if no input structure has been defined</DL>
</DD>
</DL>
<HR>

<A NAME="numPendingOutput()"><!-- --></A><H3>
numPendingOutput</H3>
<PRE>
public int <B>numPendingOutput</B>()</PRE>
<DL>
<DD>Returns the number of instances pending output<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of instances  pending output<DT><B>Throws:</B><DD><CODE>NullPointerException</CODE> - if no input structure has been defined</DL>
</DD>
</DL>
<HR>

<A NAME="isOutputFormatDefined()"><!-- --></A><H3>
isOutputFormatDefined</H3>
<PRE>
public boolean <B>isOutputFormatDefined</B>()</PRE>
<DL>
<DD>Returns whether the output format is ready to be collected<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if the output format is set</DL>
</DD>
</DL>
<HR>

<A NAME="getStringIndices(weka.core.Instances)"><!-- --></A><H3>
getStringIndices</H3>
<PRE>
protected int[] <B>getStringIndices</B>(<A HREF="../../weka/core/Instances.html">Instances</A>&nbsp;insts)</PRE>
<DL>
<DD>Gets an array containing the indices of all string attributes.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>insts</CODE> - the Instances to scan for string attributes.<DT><B>Returns:</B><DD>an array containing the indices of string attributes in
 the input structure. Will be zero-length if there are no
 string attributes</DL>
</DD>
</DL>
<HR>

<A NAME="useFilter(weka.core.Instances, weka.filters.Filter)"><!-- --></A><H3>
useFilter</H3>
<PRE>
public static <A HREF="../../weka/core/Instances.html">Instances</A> <B>useFilter</B>(<A HREF="../../weka/core/Instances.html">Instances</A>&nbsp;data,
                                  <A HREF="../../weka/filters/Filter.html">Filter</A>&nbsp;filter)
                           throws java.lang.Exception</PRE>
<DL>
<DD>Filters an entire set of instances through a filter and returns
 the new set.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - the data to be filtered<DD><CODE>filter</CODE> - the filter to be used<DT><B>Returns:</B><DD>the filtered set of data<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if the filter can't be used successfully</DL>
</DD>
</DL>
<HR>

<A NAME="filterFile(weka.filters.Filter, java.lang.String[])"><!-- --></A><H3>
filterFile</H3>
<PRE>
public static void <B>filterFile</B>(<A HREF="../../weka/filters/Filter.html">Filter</A>&nbsp;filter,
                              java.lang.String[]&nbsp;options)
                       throws java.lang.Exception</PRE>
<DL>
<DD>Method for testing filters.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>argv</CODE> - should contain the following arguments: <br>
 -i input_file <br>
 -o output_file <br>
 -c class_index <br>
 or -h for help on options<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if something goes wrong or the user requests help on
 command options</DL>
</DD>
</DL>
<HR>

<A NAME="batchFilterFile(weka.filters.Filter, java.lang.String[])"><!-- --></A><H3>
batchFilterFile</H3>
<PRE>
public static void <B>batchFilterFile</B>(<A HREF="../../weka/filters/Filter.html">Filter</A>&nbsp;filter,
                                   java.lang.String[]&nbsp;options)
                            throws java.lang.Exception</PRE>
<DL>
<DD>Method for testing filters ability to process multiple batches.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>argv</CODE> - should contain the following arguments:<br>
 -i (first) input file <br>
 -o (first) output file <br>
 -r (second) input file <br>
 -s (second) output file <br>
 -c class_index <br>
 or -h for help on options<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if something goes wrong or the user requests help on
 command options</DL>
</DD>
</DL>
<HR>

<A NAME="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <B>main</B>(java.lang.String[]&nbsp;args)</PRE>
<DL>
<DD>Main method for testing this class.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>argv</CODE> - should contain arguments to the filter: use -h for help</DL>
</DD>
</DL>
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