sparseinstance.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

 that doesn't have access to the dataset, use 
 <code>new SparseInstance(instance)</code><DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#copy()">copy</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the shallow copy</DL>
</DD>
</DL>
<HR>

<A NAME="index(int)"><!-- --></A><H3>
index</H3>
<PRE>
public int <B>index</B>(int&nbsp;position)</PRE>
<DL>
<DD>Returns the index of the attribute stored at the given position.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#index(int)">index</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>position</CODE> - the position<DT><B>Returns:</B><DD>the index of the attribute stored at the given position</DL>
</DD>
</DL>
<HR>

<A NAME="isMissing(int)"><!-- --></A><H3>
isMissing</H3>
<PRE>
public boolean <B>isMissing</B>(int&nbsp;attIndex)</PRE>
<DL>
<DD>Tests if a specific value is "missing".<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#isMissing(int)">isMissing</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attIndex</CODE> - the attribute's index</DL>
</DD>
</DL>
<HR>

<A NAME="locateIndex(int)"><!-- --></A><H3>
locateIndex</H3>
<PRE>
public int <B>locateIndex</B>(int&nbsp;index)</PRE>
<DL>
<DD>Locates the greatest index that is not greater than the
 given index.<DD><DL>
<DT><B>Returns:</B><DD>the internal index of the attribute index. Returns
 -1 if no index with this property couldn't be found</DL>
</DD>
</DL>
<HR>

<A NAME="mergeInstance(weka.core.Instance)"><!-- --></A><H3>
mergeInstance</H3>
<PRE>
public <A HREF="../../weka/core/Instance.html">Instance</A> <B>mergeInstance</B>(<A HREF="../../weka/core/Instance.html">Instance</A>&nbsp;inst)</PRE>
<DL>
<DD>Merges this instance with the given instance and returns
 the result. Dataset is set to null.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#mergeInstance(weka.core.Instance)">mergeInstance</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>inst</CODE> - the instance to be merged with this one<DT><B>Returns:</B><DD>the merged instances</DL>
</DD>
</DL>
<HR>

<A NAME="numAttributes()"><!-- --></A><H3>
numAttributes</H3>
<PRE>
public int <B>numAttributes</B>()</PRE>
<DL>
<DD>Returns the number of attributes.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#numAttributes()">numAttributes</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of attributes as an integer</DL>
</DD>
</DL>
<HR>

<A NAME="numValues()"><!-- --></A><H3>
numValues</H3>
<PRE>
public int <B>numValues</B>()</PRE>
<DL>
<DD>Returns the number of values in the sparse vector.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#numValues()">numValues</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of values</DL>
</DD>
</DL>
<HR>

<A NAME="replaceMissingValues(double[])"><!-- --></A><H3>
replaceMissingValues</H3>
<PRE>
public void <B>replaceMissingValues</B>(double[]&nbsp;array)</PRE>
<DL>
<DD>Replaces all missing values in the instance with the 
 values contained in the given array. A deep copy of
 the vector of attribute values is performed before the
 values are replaced.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#replaceMissingValues(double[])">replaceMissingValues</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>array</CODE> - containing the means and modes<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - if numbers of attributes are unequal</DL>
</DD>
</DL>
<HR>

<A NAME="setValue(int, double)"><!-- --></A><H3>
setValue</H3>
<PRE>
public void <B>setValue</B>(int&nbsp;attIndex,
                     double&nbsp;value)</PRE>
<DL>
<DD>Sets a specific value in the instance to the given value 
 (internal floating-point format). Performs a deep copy
 of the vector of attribute values before the value is set.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#setValue(int, double)">setValue</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attIndex</CODE> - the attribute's index<DD><CODE>value</CODE> - the new attribute value (If the corresponding
 attribute is nominal (or a string) then this is the new value's
 index as a double).</DL>
</DD>
</DL>
<HR>

<A NAME="setValueSparse(int, double)"><!-- --></A><H3>
setValueSparse</H3>
<PRE>
public void <B>setValueSparse</B>(int&nbsp;indexOfIndex,
                           double&nbsp;value)</PRE>
<DL>
<DD>Sets a specific value in the instance to the given value 
 (internal floating-point format). Performs a deep copy
 of the vector of attribute values before the value is set.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#setValueSparse(int, double)">setValueSparse</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>indexOfIndex</CODE> - the index of the attribute's index<DD><CODE>value</CODE> - the new attribute value (If the corresponding
 attribute is nominal (or a string) then this is the new value's
 index as a double).</DL>
</DD>
</DL>
<HR>

<A NAME="toDoubleArray()"><!-- --></A><H3>
toDoubleArray</H3>
<PRE>
public double[] <B>toDoubleArray</B>()</PRE>
<DL>
<DD>Returns the values of each attribute as an array of doubles.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#toDoubleArray()">toDoubleArray</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an array containing all the instance attribute values</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Returns the description of one instance in sparse format. 
 If the instance doesn't have access to a dataset, it returns the 
 internal floating-point values. Quotes string values that contain 
 whitespace characters.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#toString()">toString</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the instance's description as a string</DL>
</DD>
</DL>
<HR>

<A NAME="value(int)"><!-- --></A><H3>
value</H3>
<PRE>
public double <B>value</B>(int&nbsp;attIndex)</PRE>
<DL>
<DD>Returns an instance's attribute value in internal format.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/Instance.html#value(int)">value</A></CODE> in class <CODE><A HREF="../../weka/core/Instance.html">Instance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attIndex</CODE> - the attribute's index<DT><B>Returns:</B><DD>the specified value as a double (If the corresponding
 attribute is nominal (or a string) then it returns the value's index as a 
 double).</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;options)</PRE>
<DL>
<DD>Main method for testing this class.</DL>
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