euclideandistance.html

数据挖掘的最常用工具。由于开源

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<A NAME="distance(weka.core.Instance, weka.core.Instance, weka.core.neighboursearch.PerformanceStats)"><!-- --></A><H3>
distance</H3>
<PRE>
public double <B>distance</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;first,
                       <A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;second,
                       <A HREF="../../weka/core/neighboursearch/PerformanceStats.html" title="class in weka.core.neighboursearch">PerformanceStats</A>&nbsp;stats)</PRE>
<DL>
<DD>Calculates the distance (or similarity) between two instances. Need to
 pass this returned distance later on to postprocess method to set it on
 correct scale. <br/>
 P.S.: Please don't mix the use of this function with
 distance(Instance first, Instance second), as that already does post
 processing. Please consider passing Double.POSITIVE_INFINITY as the cutOffValue to
 this function and then later on do the post processing on all the
 distances.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/DistanceFunction.html#distance(weka.core.Instance, weka.core.Instance, weka.core.neighboursearch.PerformanceStats)">distance</A></CODE> in interface <CODE><A HREF="../../weka/core/DistanceFunction.html" title="interface in weka.core">DistanceFunction</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/NormalizableDistance.html#distance(weka.core.Instance, weka.core.Instance, weka.core.neighboursearch.PerformanceStats)">distance</A></CODE> in class <CODE><A HREF="../../weka/core/NormalizableDistance.html" title="class in weka.core">NormalizableDistance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>first</CODE> - the first instance<DD><CODE>second</CODE> - the second instance<DD><CODE>stats</CODE> - the structure for storing performance statistics.
<DT><B>Returns:</B><DD>the distance between the two given instances or 
                        Double.POSITIVE_INFINITY.</DL>
</DD>
</DL>
<HR>

<A NAME="postProcessDistances(double[])"><!-- --></A><H3>
postProcessDistances</H3>
<PRE>
public void <B>postProcessDistances</B>(double[]&nbsp;distances)</PRE>
<DL>
<DD>Does post processing of the distances (if necessary) returned by
 distance(distance(Instance first, Instance second, double cutOffValue). It
 is necessary to do so to get the correct distances if
 distance(distance(Instance first, Instance second, double cutOffValue) is
 used. This is because that function actually returns the squared distance
 to avoid inaccuracies arising from floating point comparison.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/DistanceFunction.html#postProcessDistances(double[])">postProcessDistances</A></CODE> in interface <CODE><A HREF="../../weka/core/DistanceFunction.html" title="interface in weka.core">DistanceFunction</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/core/NormalizableDistance.html#postProcessDistances(double[])">postProcessDistances</A></CODE> in class <CODE><A HREF="../../weka/core/NormalizableDistance.html" title="class in weka.core">NormalizableDistance</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>distances</CODE> - the distances to post-process</DL>
</DD>
</DL>
<HR>

<A NAME="sqDifference(int, double, double)"><!-- --></A><H3>
sqDifference</H3>
<PRE>
public double <B>sqDifference</B>(int&nbsp;index,
                           double&nbsp;val1,
                           double&nbsp;val2)</PRE>
<DL>
<DD>Returns the squared difference of two values of an attribute.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>index</CODE> - the attribute index<DD><CODE>val1</CODE> - the first value<DD><CODE>val2</CODE> - the second value
<DT><B>Returns:</B><DD>the squared difference</DL>
</DD>
</DL>
<HR>

<A NAME="getMiddle(double[])"><!-- --></A><H3>
getMiddle</H3>
<PRE>
public double <B>getMiddle</B>(double[]&nbsp;ranges)</PRE>
<DL>
<DD>Returns value in the middle of the two parameter values.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ranges</CODE> - the ranges to this dimension
<DT><B>Returns:</B><DD>the middle value</DL>
</DD>
</DL>
<HR>

<A NAME="closestPoint(weka.core.Instance, weka.core.Instances, int[])"><!-- --></A><H3>
closestPoint</H3>
<PRE>
public int <B>closestPoint</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance,
                        <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;allPoints,
                        int[]&nbsp;pointList)
                 throws java.lang.Exception</PRE>
<DL>
<DD>Returns the index of the closest point to the current instance.
 Index is index in Instances object that is the second parameter.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the instance to assign a cluster to<DD><CODE>allPoints</CODE> - all points<DD><CODE>pointList</CODE> - the list of points
<DT><B>Returns:</B><DD>the index of the closest point
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if something goes wrong</DL>
</DD>
</DL>
<HR>

<A NAME="valueIsSmallerEqual(weka.core.Instance, int, double)"><!-- --></A><H3>
valueIsSmallerEqual</H3>
<PRE>
public boolean <B>valueIsSmallerEqual</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance,
                                   int&nbsp;dim,
                                   double&nbsp;value)</PRE>
<DL>
<DD>Returns true if the value of the given dimension is smaller or equal the
 value to be compared with.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the instance where the value should be taken of<DD><CODE>dim</CODE> - the dimension of the value<DD><CODE>value</CODE> - the value to compare with
<DT><B>Returns:</B><DD>true if value of instance is smaller or equal value</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></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the revision</DL>
</DD>
</DL>
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