normalizabledistance.html

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                       double cutOffValue,
                       <A HREF="../../weka/core/neighboursearch/PerformanceStats.html" title="class in weka.core.neighboursearch">PerformanceStats</A>&nbsp;stats)</PRE>
<DL>
<DD>Calculates the distance between two instances. Offers speed up (if the 
 distance function class in use supports it) in nearest neighbour search by 
 taking into account the cutOff or maximum distance. Depending on the 
 distance function class, post processing of the distances by 
 postProcessDistances(double []) may be required if this function is used.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/DistanceFunction.html#distance(weka.core.Instance, weka.core.Instance, double, weka.core.neighboursearch.PerformanceStats)">distance</A></CODE> in interface <CODE><A HREF="../../weka/core/DistanceFunction.html" title="interface in weka.core">DistanceFunction</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>cutOffValue</CODE> - If the distance being calculated becomes larger than 
                    cutOffValue then the rest of the calculation is 
                    discarded.<DD><CODE>stats</CODE> - the performance stats object
<DT><B>Returns:</B><DD>the distance between the two given instances or 
                        Double.POSITIVE_INFINITY if the distance being 
                        calculated becomes larger than cutOffValue.</DL>
</DD>
</DL>
<HR>

<A NAME="initializeRanges()"><!-- --></A><H3>
initializeRanges</H3>
<PRE>
public double[][] <B>initializeRanges</B>()</PRE>
<DL>
<DD>Initializes the ranges using all instances of the dataset.
 Sets m_Ranges.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the ranges</DL>
</DD>
</DL>
<HR>

<A NAME="updateRangesFirst(weka.core.Instance, int, double[][])"><!-- --></A><H3>
updateRangesFirst</H3>
<PRE>
public void <B>updateRangesFirst</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance,
                              int&nbsp;numAtt,
                              double[][]&nbsp;ranges)</PRE>
<DL>
<DD>Used to initialize the ranges. For this the values of the first
 instance is used to save time.
 Sets low and high to the values of the first instance and
 width to zero.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the new instance<DD><CODE>numAtt</CODE> - number of attributes in the model<DD><CODE>ranges</CODE> - low, high and width values for all attributes</DL>
</DD>
</DL>
<HR>

<A NAME="updateRanges(weka.core.Instance, int, double[][])"><!-- --></A><H3>
updateRanges</H3>
<PRE>
public void <B>updateRanges</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance,
                         int&nbsp;numAtt,
                         double[][]&nbsp;ranges)</PRE>
<DL>
<DD>Updates the minimum and maximum and width values for all the attributes
 based on a new instance.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the new instance<DD><CODE>numAtt</CODE> - number of attributes in the model<DD><CODE>ranges</CODE> - low, high and width values for all attributes</DL>
</DD>
</DL>
<HR>

<A NAME="initializeRangesEmpty(int, double[][])"><!-- --></A><H3>
initializeRangesEmpty</H3>
<PRE>
public void <B>initializeRangesEmpty</B>(int&nbsp;numAtt,
                                  double[][]&nbsp;ranges)</PRE>
<DL>
<DD>Used to initialize the ranges.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>numAtt</CODE> - number of attributes in the model<DD><CODE>ranges</CODE> - low, high and width values for all attributes</DL>
</DD>
</DL>
<HR>

<A NAME="updateRanges(weka.core.Instance, double[][])"><!-- --></A><H3>
updateRanges</H3>
<PRE>
public double[][] <B>updateRanges</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance,
                               double[][]&nbsp;ranges)</PRE>
<DL>
<DD>Updates the ranges given a new instance.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the new instance<DD><CODE>ranges</CODE> - low, high and width values for all attributes
<DT><B>Returns:</B><DD>the updated ranges</DL>
</DD>
</DL>
<HR>

<A NAME="initializeRanges(int[])"><!-- --></A><H3>
initializeRanges</H3>
<PRE>
public double[][] <B>initializeRanges</B>(int[]&nbsp;instList)
                            throws java.lang.Exception</PRE>
<DL>
<DD>Initializes the ranges of a subset of the instances of this dataset.
 Therefore m_Ranges is not set.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instList</CODE> - list of indexes of the subset
<DT><B>Returns:</B><DD>the ranges
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if something goes wrong</DL>
</DD>
</DL>
<HR>

<A NAME="initializeRanges(int[], int, int)"><!-- --></A><H3>
initializeRanges</H3>
<PRE>
public double[][] <B>initializeRanges</B>(int[]&nbsp;instList,
                                   int&nbsp;startIdx,
                                   int&nbsp;endIdx)
                            throws java.lang.Exception</PRE>
<DL>
<DD>Initializes the ranges of a subset of the instances of this dataset.
 Therefore m_Ranges is not set.
 The caller of this method should ensure that the supplied start and end 
 indices are valid (start &lt;= end, end&lt;instList.length etc) and
 correct.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instList</CODE> - list of indexes of the instances<DD><CODE>startIdx</CODE> - start index of the subset of instances in the indices array<DD><CODE>endIdx</CODE> - end index of the subset of instances in the indices array
<DT><B>Returns:</B><DD>the ranges
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if something goes wrong</DL>
</DD>
</DL>
<HR>

<A NAME="updateRanges(weka.core.Instance)"><!-- --></A><H3>
updateRanges</H3>
<PRE>
public void <B>updateRanges</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)</PRE>
<DL>
<DD>Update the ranges if a new instance comes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the new instance</DL>
</DD>
</DL>
<HR>

<A NAME="inRanges(weka.core.Instance, double[][])"><!-- --></A><H3>
inRanges</H3>
<PRE>
public boolean <B>inRanges</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance,
                        double[][]&nbsp;ranges)</PRE>
<DL>
<DD>Test if an instance is within the given ranges.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the instance<DD><CODE>ranges</CODE> - the ranges the instance is tested to be in
<DT><B>Returns:</B><DD>true    if instance is within the ranges</DL>
</DD>
</DL>
<HR>

<A NAME="rangesSet()"><!-- --></A><H3>
rangesSet</H3>
<PRE>
public boolean <B>rangesSet</B>()</PRE>
<DL>
<DD>Check if ranges are set.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if ranges are set</DL>
</DD>
</DL>
<HR>

<A NAME="getRanges()"><!-- --></A><H3>
getRanges</H3>
<PRE>
public double[][] <B>getRanges</B>()
                     throws java.lang.Exception</PRE>
<DL>
<DD>Method to get the ranges.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the ranges
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if no randes are set yet</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Returns an empty string.
<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>an empty string</DL>
</DD>
</DL>
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