principalcomponents.html

数据挖掘的最常用工具。由于开源

<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the maximum number of attributes</DL>
</DD>
</DL>
<HR>

<A NAME="transformBackToOriginalTipText()"><!-- --></A><H3>
transformBackToOriginalTipText</H3>
<PRE>
public java.lang.String <B>transformBackToOriginalTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setTransformBackToOriginal(boolean)"><!-- --></A><H3>
setTransformBackToOriginal</H3>
<PRE>
public void <B>setTransformBackToOriginal</B>(boolean&nbsp;b)</PRE>
<DL>
<DD>Sets whether the data should be transformed back to the original
 space
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - true if the data should be transformed back to the
 original space</DL>
</DD>
</DL>
<HR>

<A NAME="getTransformBackToOriginal()"><!-- --></A><H3>
getTransformBackToOriginal</H3>
<PRE>
public boolean <B>getTransformBackToOriginal</B>()</PRE>
<DL>
<DD>Gets whether the data is to be transformed back to the original
 space.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if the data is to be transformed back to the original space</DL>
</DD>
</DL>
<HR>

<A NAME="getOptions()"><!-- --></A><H3>
getOptions</H3>
<PRE>
public java.lang.String[] <B>getOptions</B>()</PRE>
<DL>
<DD>Gets the current settings of PrincipalComponents
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#getOptions()">getOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>an array of strings suitable for passing to setOptions()</DL>
</DD>
</DL>
<HR>

<A NAME="getCapabilities()"><!-- --></A><H3>
getCapabilities</H3>
<PRE>
public <A HREF="../../weka/core/Capabilities.html" title="class in weka.core">Capabilities</A> <B>getCapabilities</B>()</PRE>
<DL>
<DD>Returns the capabilities of this evaluator.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/CapabilitiesHandler.html#getCapabilities()">getCapabilities</A></CODE> in interface <CODE><A HREF="../../weka/core/CapabilitiesHandler.html" title="interface in weka.core">CapabilitiesHandler</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/attributeSelection/ASEvaluation.html#getCapabilities()">getCapabilities</A></CODE> in class <CODE><A HREF="../../weka/attributeSelection/ASEvaluation.html" title="class in weka.attributeSelection">ASEvaluation</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the capabilities of this evaluator<DT><B>See Also:</B><DD><A HREF="../../weka/core/Capabilities.html" title="class in weka.core"><CODE>Capabilities</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="buildEvaluator(weka.core.Instances)"><!-- --></A><H3>
buildEvaluator</H3>
<PRE>
public void <B>buildEvaluator</B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;data)
                    throws java.lang.Exception</PRE>
<DL>
<DD>Initializes principal components and performs the analysis
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/ASEvaluation.html#buildEvaluator(weka.core.Instances)">buildEvaluator</A></CODE> in class <CODE><A HREF="../../weka/attributeSelection/ASEvaluation.html" title="class in weka.attributeSelection">ASEvaluation</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - the instances to analyse/transform
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if analysis fails</DL>
</DD>
</DL>
<HR>

<A NAME="transformedHeader()"><!-- --></A><H3>
transformedHeader</H3>
<PRE>
public <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>transformedHeader</B>()
                            throws java.lang.Exception</PRE>
<DL>
<DD>Returns just the header for the transformed data (ie. an empty
 set of instances. This is so that AttributeSelection can
 determine the structure of the transformed data without actually
 having to get all the transformed data through getTransformedData().
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/AttributeTransformer.html#transformedHeader()">transformedHeader</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/AttributeTransformer.html" title="interface in weka.attributeSelection">AttributeTransformer</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the header of the transformed data.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the header of the transformed data can't
 be determined.</DL>
</DD>
</DL>
<HR>

<A NAME="transformedData()"><!-- --></A><H3>
transformedData</H3>
<PRE>
public <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>transformedData</B>()
                          throws java.lang.Exception</PRE>
<DL>
<DD>Gets the transformed training data.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/AttributeTransformer.html#transformedData()">transformedData</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/AttributeTransformer.html" title="interface in weka.attributeSelection">AttributeTransformer</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the transformed training data
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if transformed data can't be returned</DL>
</DD>
</DL>
<HR>

<A NAME="evaluateAttribute(int)"><!-- --></A><H3>
evaluateAttribute</H3>
<PRE>
public double <B>evaluateAttribute</B>(int&nbsp;att)
                         throws java.lang.Exception</PRE>
<DL>
<DD>Evaluates the merit of a transformed attribute. This is defined
 to be 1 minus the cumulative variance explained. Merit can't
 be meaningfully evaluated if the data is to be transformed back
 to the original space.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/AttributeEvaluator.html#evaluateAttribute(int)">evaluateAttribute</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/AttributeEvaluator.html" title="interface in weka.attributeSelection">AttributeEvaluator</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>att</CODE> - the attribute to be evaluated
<DT><B>Returns:</B><DD>the merit of a transformed attribute
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if attribute can't be evaluated</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Returns a description of this attribute transformer
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a String describing this attribute transformer</DL>
</DD>
</DL>
<HR>

<A NAME="convertInstance(weka.core.Instance)"><!-- --></A><H3>
convertInstance</H3>
<PRE>
public <A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A> <B>convertInstance</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)
                         throws java.lang.Exception</PRE>
<DL>
<DD>Transform an instance in original (unormalized) format. Convert back
 to the original space if requested.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/attributeSelection/AttributeTransformer.html#convertInstance(weka.core.Instance)">convertInstance</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/AttributeTransformer.html" title="interface in weka.attributeSelection">AttributeTransformer</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - an instance in the original (unormalized) format
<DT><B>Returns:</B><DD>a transformed instance
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if instance cant be transformed</DL>
</DD>
</DL>
<HR>

<A NAME="getRevision()"><!-- --></A><H3>
getRevision</H3>
<PRE>
public java.lang.String <B>getRevision</B>()</PRE>
<DL>
<DD>Returns the revision string.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/RevisionHandler.html#getRevision()">getRevision</A></CODE> in interface <CODE><A HREF="../../weka/core/RevisionHandler.html" title="interface in weka.core">RevisionHandler</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/attributeSelection/ASEvaluation.html#getRevision()">getRevision</A></CODE> in class <CODE><A HREF="../../weka/attributeSelection/ASEvaluation.html" title="class in weka.attributeSelection">ASEvaluation</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the revision</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;argv)</PRE>
<DL>
<DD>Main method for testing this class
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>argv</CODE> - should contain the command line arguments to the
 evaluator/transformer (see AttributeSelection)</DL>
</DD>
</DL>
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