instancesutil.html

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                                     throws java.lang.IllegalArgumentException</PRE>
<DL>
<DD>Calculatutes the number of vectors in the data space that are smaller 
 or equal than the given instance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the given instance
<DT><B>Returns:</B><DD>the number of vectors in the data space smaller or equal 
 than the given instance
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if there are numeric attributes</DL>
</DD>
</DL>
<HR>

<A NAME="numberOfGreaterVectors(weka.core.Instance)"><!-- --></A><H3>
numberOfGreaterVectors</H3>
<PRE>
public static double <B>numberOfGreaterVectors</B>(<A HREF="../../../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)
                                     throws java.lang.IllegalArgumentException</PRE>
<DL>
<DD>Calculatutes the number of vectors in the data space that are 
 greater or equal than the given instance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the given instance
<DT><B>Returns:</B><DD>the number of vectors in the data space greater of equal
 than the given instance
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if there are numeric attributes</DL>
</DD>
</DL>
<HR>

<A NAME="write(weka.core.Instances, java.io.BufferedWriter)"><!-- --></A><H3>
write</H3>
<PRE>
public static void <B>write</B>(<A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances,
                         java.io.BufferedWriter&nbsp;file)
                  throws java.io.IOException</PRE>
<DL>
<DD>Write the instances in ARFF-format to the indicated 
 <code> BufferedWriter </code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - the instances to write<DD><CODE>file</CODE> - the <code> BufferedWriter </code> to write to
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if something goes wrong while writing the instances</DL>
</DD>
</DL>
<HR>

<A NAME="countValues(weka.core.Instances, int)"><!-- --></A><H3>
countValues</H3>
<PRE>
public static <A HREF="../../../../weka/estimators/DiscreteEstimator.html" title="class in weka.estimators">DiscreteEstimator</A> <B>countValues</B>(<A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances,
                                            int&nbsp;attributeIndex)
                                     throws java.lang.IllegalArgumentException</PRE>
<DL>
<DD>Return a histogram of the values for the specified attribute.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - the instances<DD><CODE>attributeIndex</CODE> - the attribute to consider
<DT><B>Returns:</B><DD>a <code> DiscreteEstimator </code> where the <code>i</code>th
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if the attribute at the specified 
 index is numeric</DL>
</DD>
</DL>
<HR>

<A NAME="sampleWithoutReplacement(weka.core.Instances, int, java.util.Random)"><!-- --></A><H3>
sampleWithoutReplacement</H3>
<PRE>
public static <A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>sampleWithoutReplacement</B>(<A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances,
                                                 int&nbsp;size,
                                                 java.util.Random&nbsp;random)</PRE>
<DL>
<DD>Create, without replacement, a random subsample of the given size 
 from the given instances.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - the instances to sample from<DD><CODE>size</CODE> - the requested size of the sample<DD><CODE>random</CODE> - the random generator to use
<DT><B>Returns:</B><DD>a sample of the requested size, drawn from the given
 instances without replacement
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if the size exceeds the number
 of instances</DL>
</DD>
</DL>
<HR>

<A NAME="generateRandomSample(weka.core.Instances, int, java.util.Random)"><!-- --></A><H3>
generateRandomSample</H3>
<PRE>
public static <A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>generateRandomSample</B>(<A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;headerInfo,
                                             int&nbsp;numberOfExamples,
                                             java.util.Random&nbsp;random)
                                      throws java.lang.IllegalArgumentException</PRE>
<DL>
<DD>Generates a random sample of instances.  Each attribute must be nominal, and the 
 class labels are not set.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>headerInfo</CODE> - Instances whose header information is used to determine how the 
 set of returned instances will look<DD><CODE>numberOfExamples</CODE> - the desired size of the returned set<DD><CODE>random</CODE> - the random number generator to use
<DT><B>Returns:</B><DD>a set of Instances containing the random sample.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if numeric attributes are given</DL>
</DD>
</DL>
<HR>

<A NAME="toDataDouble(weka.core.Instance)"><!-- --></A><H3>
toDataDouble</H3>
<PRE>
public static double[] <B>toDataDouble</B>(<A HREF="../../../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)</PRE>
<DL>
<DD>Returns an array containing the attribute values (in internal floating 
 point format) of the given instance in data space, this is, the class 
 attribute (if any) is removed.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the instance to get the attribute values from
<DT><B>Returns:</B><DD>array of doubles containing the attribute values</DL>
</DD>
</DL>
<HR>

<A NAME="minimalExtension(weka.core.Instances, weka.core.Instance)"><!-- --></A><H3>
minimalExtension</H3>
<PRE>
public static double <B>minimalExtension</B>(<A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances,
                                      <A HREF="../../../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)</PRE>
<DL>
<DD>Computes the minimal extension for a given instance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - the set of instances<DD><CODE>instance</CODE> - the instance for which the minimal extension is to be
 calculated
<DT><B>Returns:</B><DD>the value of the minimal extension, in internal floating point
 format</DL>
</DD>
</DL>
<HR>

<A NAME="minimalExtension(weka.core.Instances, weka.core.Instance, double)"><!-- --></A><H3>
minimalExtension</H3>
<PRE>
public static double <B>minimalExtension</B>(<A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances,
                                      <A HREF="../../../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance,
                                      double&nbsp;minValue)</PRE>
<DL>
<DD>Computes the minimal extension of a given instance, but the 
 minimal value returned is <code> minValue. </code>  This method
 may have its applications when the training set is divided into
 multiple Instances objects.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - the set of instances<DD><CODE>instance</CODE> - the instance for which the minimal extension is to 
 be calculated<DD><CODE>minValue</CODE> - a double indicating the minimal value that should 
 be returned
<DT><B>Returns:</B><DD>the label of the minimal extension, in internal floating point format</DL>
</DD>
</DL>
<HR>

<A NAME="maximalExtension(weka.core.Instances, weka.core.Instance)"><!-- --></A><H3>
maximalExtension</H3>
<PRE>
public static double <B>maximalExtension</B>(<A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances,
                                      <A HREF="../../../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)</PRE>
<DL>
<DD>Computes the maximal extension for a given instance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - the set of instances<DD><CODE>instance</CODE> - the instance for which the minimal extension is to be
 calculated
<DT><B>Returns:</B><DD>the value of the minimal extension, in internal floating point
 format</DL>
</DD>
</DL>
<HR>

<A NAME="maximalExtension(weka.core.Instances, weka.core.Instance, double)"><!-- --></A><H3>
maximalExtension</H3>
<PRE>
public static double <B>maximalExtension</B>(<A HREF="../../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances,
                                      <A HREF="../../../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance,
                                      double&nbsp;maxValue)</PRE>
<DL>
<DD>Computes the maximal extension of a given instance, but the 
 maximal value returned is <code> maxValue. </code>  This method
 may have its applications when the training set is divided into
 multiple Instances objects.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - the set of instances<DD><CODE>instance</CODE> - the instance for which the maximal extension is to 
 be calculated<DD><CODE>maxValue</CODE> - a double indicating the maximal value that should 
 be returned
<DT><B>Returns:</B><DD>the value of the minimal extension, in internal floating point
 format</DL>
</DD>
</DL>
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