principalcomponents.html

< 数据挖掘--实用机器学习技术及java实现> 一书结合数据挖掘和机器学习的知识,作者陈述了自动挖掘模式的基础理论,并且以java语言实现了具有代表性的各类数据挖掘方法.例如:class

<A NAME="listOptions()"><!-- --></A><H3>
listOptions</H3>
<PRE>
public java.util.Enumeration <B>listOptions</B>()</PRE>
<DL>
<DD>Returns an enumeration describing the available options <p>

 -N <classifier>
 Don't normalize the input data. <p><DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#listOptions()">listOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an enumeration of all the available options</DL>
</DD>
</DL>
<HR>

<A NAME="setOptions(java.lang.String[])"><!-- --></A><H3>
setOptions</H3>
<PRE>
public void <B>setOptions</B>(java.lang.String[]&nbsp;options)
                throws java.lang.Exception</PRE>
<DL>
<DD>Parses a given list of options.

 Valid options are:<p>
 -N <classifier>
 Don't normalize the input data. <p><DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#setOptions(java.lang.String[])">setOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>options</CODE> - the list of options as an array of strings<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an option is not supported</DL>
</DD>
</DL>
<HR>

<A NAME="normalizeTipText()"><!-- --></A><H3>
normalizeTipText</H3>
<PRE>
public java.lang.String <B>normalizeTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<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="setNormalize(boolean)"><!-- --></A><H3>
setNormalize</H3>
<PRE>
public void <B>setNormalize</B>(boolean&nbsp;n)</PRE>
<DL>
<DD>Set whether input data will be normalized.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - true if input data is to be normalized</DL>
</DD>
</DL>
<HR>

<A NAME="getNormalize()"><!-- --></A><H3>
getNormalize</H3>
<PRE>
public boolean <B>getNormalize</B>()</PRE>
<DL>
<DD>Gets whether or not input data is to be normalized<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if input data is to be normalized</DL>
</DD>
</DL>
<HR>

<A NAME="varianceCoveredTipText()"><!-- --></A><H3>
varianceCoveredTipText</H3>
<PRE>
public java.lang.String <B>varianceCoveredTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<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="setVarianceCovered(double)"><!-- --></A><H3>
setVarianceCovered</H3>
<PRE>
public void <B>setVarianceCovered</B>(double&nbsp;vc)</PRE>
<DL>
<DD>Sets the amount of variance to account for when retaining
 principal components<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>vc</CODE> - the proportion of total variance to account for</DL>
</DD>
</DL>
<HR>

<A NAME="getVarianceCovered()"><!-- --></A><H3>
getVarianceCovered</H3>
<PRE>
public double <B>getVarianceCovered</B>()</PRE>
<DL>
<DD>Gets the proportion of total variance to account for when
 retaining principal components<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the proportion of variance to account for</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<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<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.<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<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">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="buildEvaluator(weka.core.Instances)"><!-- --></A><H3>
buildEvaluator</H3>
<PRE>
public void <B>buildEvaluator</B>(<A HREF="../../weka/core/Instances.html">Instances</A>&nbsp;data)
                    throws java.lang.Exception</PRE>
<DL>
<DD>Initializes principal components and performs the analysis<DD><DL>
<DT><B>Overrides:</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">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">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().<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">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">Instances</A> <B>transformedData</B>()
                          throws java.lang.Exception</PRE>
<DL>
<DD>Gets the transformed training data.<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">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.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/attributeSelection/AttributeEvaluator.html#evaluateAttribute(int)">evaluateAttribute</A></CODE> in class <CODE><A HREF="../../weka/attributeSelection/AttributeEvaluator.html">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<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">Instance</A> <B>convertInstance</B>(<A HREF="../../weka/core/Instance.html">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.<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">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="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<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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