m5utils.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

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<A NAME="M5Utils()"><!-- --></A><H3>
M5Utils</H3>
<PRE>
public <B>M5Utils</B>()</PRE>
<DL>
</DL>

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<B>Method Detail</B></FONT></TD>
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<A NAME="hasEnumAttr(weka.core.Instances)"><!-- --></A><H3>
hasEnumAttr</H3>
<PRE>
public static final boolean <B>hasEnumAttr</B>(<A HREF="../../../weka/core/Instances.html">Instances</A>&nbsp;inst)</PRE>
<DL>
<DD>Tests if enumerated attribute(s) exists in the instances<DD><DL>
<DT><B>Parameters:</B><DD><CODE>inst</CODE> - instances<DT><B>Returns:</B><DD>true if there is at least one; false if none</DL>
</DD>
</DL>
<HR>

<A NAME="hasMissing(weka.core.Instances)"><!-- --></A><H3>
hasMissing</H3>
<PRE>
public static final boolean <B>hasMissing</B>(<A HREF="../../../weka/core/Instances.html">Instances</A>&nbsp;inst)</PRE>
<DL>
<DD>Tests if missing value(s) exists in the instances<DD><DL>
<DT><B>Parameters:</B><DD><CODE>inst</CODE> - instances<DT><B>Returns:</B><DD>true if there is missing value(s); false if none</DL>
</DD>
</DL>
<HR>

<A NAME="sum(int, weka.core.Instances)"><!-- --></A><H3>
sum</H3>
<PRE>
public static final double <B>sum</B>(int&nbsp;attr,
                               <A HREF="../../../weka/core/Instances.html">Instances</A>&nbsp;inst)</PRE>
<DL>
<DD>Returns the sum of the instances values of an attribute<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attr</CODE> - an attribute<DD><CODE>inst</CODE> - instances<DT><B>Returns:</B><DD>the sum value</DL>
</DD>
</DL>
<HR>

<A NAME="sqrSum(int, weka.core.Instances)"><!-- --></A><H3>
sqrSum</H3>
<PRE>
public static final double <B>sqrSum</B>(int&nbsp;attr,
                                  <A HREF="../../../weka/core/Instances.html">Instances</A>&nbsp;inst)</PRE>
<DL>
<DD>Returns the squared sum of the instances values of an attribute<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attr</CODE> - an attribute<DD><CODE>inst</CODE> - instances<DT><B>Returns:</B><DD>the squared sum value</DL>
</DD>
</DL>
<HR>

<A NAME="stdDev(int, weka.core.Instances)"><!-- --></A><H3>
stdDev</H3>
<PRE>
public static final double <B>stdDev</B>(int&nbsp;attr,
                                  <A HREF="../../../weka/core/Instances.html">Instances</A>&nbsp;inst)</PRE>
<DL>
<DD>Returns the standard deviation value of the instances values of an attribute<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attr</CODE> - an attribute<DD><CODE>inst</CODE> - instances<DT><B>Returns:</B><DD>the standard deviation value</DL>
</DD>
</DL>
<HR>

<A NAME="absDev(int, weka.core.Instances)"><!-- --></A><H3>
absDev</H3>
<PRE>
public static final double <B>absDev</B>(int&nbsp;attr,
                                  <A HREF="../../../weka/core/Instances.html">Instances</A>&nbsp;inst)</PRE>
<DL>
<DD>Returns the absolute deviation value of the instances values of an attribute<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attr</CODE> - an attribute<DD><CODE>inst</CODE> - instances<DT><B>Returns:</B><DD>the absolute deviation value</DL>
</DD>
</DL>
<HR>

<A NAME="variance(int, weka.core.Instances)"><!-- --></A><H3>
variance</H3>
<PRE>
public static final double <B>variance</B>(int&nbsp;attr,
                                    <A HREF="../../../weka/core/Instances.html">Instances</A>&nbsp;inst)</PRE>
<DL>
<DD>Returns the variance value of the instances values of an attribute<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attr</CODE> - an attribute<DD><CODE>inst</CODE> - instances<DT><B>Returns:</B><DD>the variance value</DL>
</DD>
</DL>
<HR>

<A NAME="roundDouble(double)"><!-- --></A><H3>
roundDouble</H3>
<PRE>
public static final long <B>roundDouble</B>(double&nbsp;value)</PRE>
<DL>
<DD>Rounds a double<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the double value<DT><B>Returns:</B><DD>the double rounded</DL>
</DD>
</DL>
<HR>

<A NAME="floorDouble(double)"><!-- --></A><H3>
floorDouble</H3>
<PRE>
public static final long <B>floorDouble</B>(double&nbsp;value)</PRE>
<DL>
<DD>Returns the largest (closest to positive infinity) long integer value that is not greater than the argument.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the double value<DT><B>Returns:</B><DD>the floor integer</DL>
</DD>
</DL>
<HR>

<A NAME="doubleToStringF(double, int, int)"><!-- --></A><H3>
doubleToStringF</H3>
<PRE>
public static final java.lang.String <B>doubleToStringF</B>(double&nbsp;value,
                                                     int&nbsp;width,
                                                     int&nbsp;afterDecimalPoint)</PRE>
<DL>
<DD>Rounds a double and converts it into a formatted right-justified String.
 It is like %f format in C language.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the double value<DD><CODE>width</CODE> - the width of the string<DD><CODE>afterDecimalPoint</CODE> - the number of digits after the decimal point<DT><B>Returns:</B><DD>the double as a formatted string</DL>
</DD>
</DL>
<HR>

<A NAME="doubleToStringG(double, int, int)"><!-- --></A><H3>
doubleToStringG</H3>
<PRE>
public static final java.lang.String <B>doubleToStringG</B>(double&nbsp;value,
                                                     int&nbsp;width,
                                                     int&nbsp;precision)</PRE>
<DL>
<DD>Rounds a double and converts it into a formatted right-justified String. If the double is not equal to zero and not in the range [10e-3,10e7] it is returned in scientific format.
 It is like %g format in C language.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the double value<DD><CODE>width</CODE> - the width of the string<DD><CODE>precision</CODE> - the number of valid digits<DT><B>Returns:</B><DD>the double as a formatted string</DL>
</DD>
</DL>
<HR>

<A NAME="deleteTrailingZerosAndDot(java.lang.StringBuffer)"><!-- --></A><H3>
deleteTrailingZerosAndDot</H3>
<PRE>
public static final java.lang.StringBuffer <B>deleteTrailingZerosAndDot</B>(java.lang.StringBuffer&nbsp;stringBuffer)</PRE>
<DL>
<DD>Deletes the trailing zeros and decimal point in a stringBuffer<DD><DL>
<DT><B>Parameters:</B><DD><CODE>stringBuffer</CODE> - string buffer
 return string buffer with deleted trailing zeros and decimal point</DL>
</DD>
</DL>
<HR>

<A NAME="smoothenValue(double, double, int, int)"><!-- --></A><H3>
smoothenValue</H3>
<PRE>
public static final double <B>smoothenValue</B>(double&nbsp;p,
                                         double&nbsp;q,
                                         int&nbsp;n,
                                         int&nbsp;k)</PRE>
<DL>
<DD>Returns the smoothed values according to the smoothing formula (np+kq)/(n+k)<DD><DL>
<DT><B>Parameters:</B><DD><CODE>p</CODE> - a double, normally is the prediction of the model at the current node<DD><CODE>q</CODE> - a double, normally is the prediction of the model at the up node<DD><CODE>n</CODE> - the number of instances at the up node<DD><CODE>k</CODE> - the smoothing constance, default =15<DT><B>Returns:</B><DD>the smoothed value</DL>
</DD>
</DL>
<HR>

<A NAME="correlation(double[], double[], int)"><!-- --></A><H3>
correlation</H3>
<PRE>
public static final double <B>correlation</B>(double[]&nbsp;y1,
                                       double[]&nbsp;y2,
                                       int&nbsp;n)</PRE>
<DL>
<DD>Returns the correlation coefficient of two double vectors<DD><DL>
<DT><B>Parameters:</B><DD><CODE>y1</CODE> - double vector 1<DD><CODE>y2</CODE> - double vector 2<DD><CODE>n</CODE> - the length of two double vectors<DT><B>Returns:</B><DD>the correlation coefficient</DL>
</DD>
</DL>
<HR>

<A NAME="eqDouble(double, double)"><!-- --></A><H3>
eqDouble</H3>
<PRE>
public static final boolean <B>eqDouble</B>(double&nbsp;a,
                                     double&nbsp;b)</PRE>
<DL>
<DD>Tests if two double values are equal to each other<DD><DL>
<DT><B>Parameters:</B><DD><CODE>a</CODE> - double 1<DD><CODE>b</CODE> - double 2<DT><B>Returns:</B><DD>true if equal; false if not equal</DL>
</DD>
</DL>
<HR>

<A NAME="errorMsg(java.lang.String)"><!-- --></A><H3>
errorMsg</H3>
<PRE>
public static final void <B>errorMsg</B>(java.lang.String&nbsp;err)</PRE>
<DL>
<DD>Prints error message and exits<DD><DL>
<DT><B>Parameters:</B><DD><CODE>err</CODE> - error message</DL>
</DD>
</DL>
<HR>

<A NAME="separatorToString()"><!-- --></A><H3>
separatorToString</H3>
<PRE>
public static final java.lang.String <B>separatorToString</B>()</PRE>
<DL>
<DD>Prints sepearating line</DL>
<HR>

<A NAME="headToString()"><!-- --></A><H3>
headToString</H3>
<PRE>
public static final java.lang.String <B>headToString</B>()</PRE>
<DL>
<DD>Prints the head lines of the output</DL>
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