📄 j48.html
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<TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#setNumFolds(int)">setNumFolds</A></B>(int v)</CODE><BR> Set the value of numFolds.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#setOptions(java.lang.String[])">setOptions</A></B>(java.lang.String[] options)</CODE><BR> Parses a given list of options.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#setReducedErrorPruning(boolean)">setReducedErrorPruning</A></B>(boolean v)</CODE><BR> Set the value of reducedErrorPruning.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#setSaveInstanceData(boolean)">setSaveInstanceData</A></B>(boolean v)</CODE><BR> Set whether instance data is to be saved.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#setSubtreeRaising(boolean)">setSubtreeRaising</A></B>(boolean v)</CODE><BR> Set the value of subtreeRaising.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#setUnpruned(boolean)">setUnpruned</A></B>(boolean v)</CODE><BR> Set the value of unpruned.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#setUseLaplace(boolean)">setUseLaplace</A></B>(boolean newuseLaplace)</CODE><BR> Set the value of useLaplace.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#toSource(java.lang.String)">toSource</A></B>(java.lang.String className)</CODE><BR> Returns tree as an if-then statement.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#toString()">toString</A></B>()</CODE><BR> Returns a description of the classifier.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../../weka/classifiers/j48/J48.html#toSummaryString()">toSummaryString</A></B>()</CODE><BR> Returns a superconcise version of the model</TD></TR></TABLE> <A NAME="methods_inherited_from_class_weka.classifiers.Classifier"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class weka.classifiers.<A HREF="../../../weka/classifiers/Classifier.html">Classifier</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../weka/classifiers/Classifier.html#forName(java.lang.String, java.lang.String[])">forName</A>, <A HREF="../../../weka/classifiers/Classifier.html#makeCopies(weka.classifiers.Classifier, int)">makeCopies</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TD></TR></TABLE><A NAME="J48()"><!-- --></A><H3>J48</H3><PRE>public <B>J48</B>()</PRE><DL></DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="buildClassifier(weka.core.Instances)"><!-- --></A><H3>buildClassifier</H3><PRE>public void <B>buildClassifier</B>(<A HREF="../../../weka/core/Instances.html">Instances</A> instances) throws java.lang.Exception</PRE><DL><DD>Generates the classifier.<DD><DL><DT><B>Overrides:</B><DD><CODE><A HREF="../../../weka/classifiers/Classifier.html#buildClassifier(weka.core.Instances)">buildClassifier</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/Classifier.html">Classifier</A></CODE></DL></DD><DD><DL><DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if classifier can't be built successfully</DL></DD></DL><HR><A NAME="classifyInstance(weka.core.Instance)"><!-- --></A><H3>classifyInstance</H3><PRE>public double <B>classifyInstance</B>(<A HREF="../../../weka/core/Instance.html">Instance</A> instance) throws java.lang.Exception</PRE><DL><DD>Classifies an instance.<DD><DL><DT><B>Overrides:</B><DD><CODE><A HREF="../../../weka/classifiers/DistributionClassifier.html#classifyInstance(weka.core.Instance)">classifyInstance</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/DistributionClassifier.html">DistributionClassifier</A></CODE></DL></DD><DD><DL><DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if instance can't be classified successfully</DL></DD></DL><HR><A NAME="distributionForInstance(weka.core.Instance)"><!-- --></A><H3>distributionForInstance</H3><PRE>public final double[] <B>distributionForInstance</B>(<A HREF="../../../weka/core/Instance.html">Instance</A> instance) throws java.lang.Exception</PRE><DL><DD>Returns class probabilities for an instance.<DD><DL><DT><B>Overrides:</B><DD><CODE><A HREF="../../../weka/classifiers/DistributionClassifier.html#distributionForInstance(weka.core.Instance)">distributionForInstance</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/DistributionClassifier.html">DistributionClassifier</A></CODE></DL></DD><DD><DL><DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if distribution can't be computed successfully</DL></DD></DL><HR><A NAME="graph()"><!-- --></A><H3>graph</H3><PRE>public java.lang.String <B>graph</B>() throws java.lang.Exception</PRE><DL><DD>Returns graph describing the tree.<DD><DL><DT><B>Specified by: </B><DD><CODE><A HREF="../../../weka/core/Drawable.html#graph()">graph</A></CODE> in interface <CODE><A HREF="../../../weka/core/Drawable.html">Drawable</A></CODE></DL></DD><DD><DL><DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if graph can't be computed</DL></DD></DL><HR><A NAME="prefix()"><!-- --></A><H3>prefix</H3><PRE>public java.lang.String <B>prefix</B>() throws java.lang.Exception</PRE><DL><DD>Returns tree in prefix order.<DD><DL><DT><B>Specified by: </B><DD><CODE><A HREF="../../../weka/core/Matchable.html#prefix()">prefix</A></CODE> in interface <CODE><A HREF="../../../weka/core/Matchable.html">Matchable</A></CODE></DL></DD><DD><DL><DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if something goes wrong</DL></DD></DL><HR><A NAME="toSource(java.lang.String)"><!-- --></A><H3>toSource</H3><PRE>public java.lang.String <B>toSource</B>(java.lang.String className) throws java.lang.Exception</PRE><DL><DD>Returns tree as an if-then statement.<DD><DL><DT><B>Specified by: </B><DD><CODE><A HREF="../../../weka/classifiers/Sourcable.html#toSource(java.lang.String)">toSource</A></CODE> in interface <CODE><A HREF="../../../weka/classifiers/Sourcable.html">Sourcable</A></CODE></DL></DD><DD><DL><DT><B>Returns:</B><DD>the tree as a Java if-then type statement<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if something goes wrong</DL></DD></DL><HR><A NAME="listOptions()"><!-- --></A><H3>listOptions</H3><PRE>public java.util.Enumeration <B>listOptions</B>()</PRE><DL><DD>Returns an enumeration describing the available options Valid options are: <p> -U <br> Use unpruned tree.<p> -C confidence <br> Set confidence threshold for pruning. (Default: 0.25) <p> -M number <br> Set minimum number of instances per leaf. (Default: 2) <p> -R <br> Use reduced error pruning. No subtree raising is performed. <p> -N number <br> Set number of folds for reduced error pruning. One fold is used as the pruning set. (Default: 3) <p> -B <br> Use binary splits for nominal attributes. <p> -S <br> Don't perform subtree raising. <p> -L <br> Do not clean up after the tree has been built. -A <br> If set, Laplace smoothing is used for predicted probabilites. <p><DD><DL><DT><B>Specified by: </B><DD><CODE><A HREF="../../../weka/core/OptionHandler.html#listOptions()">listOptions</A></CODE> in interface <CODE><A HREF="../../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL></DD><DD><DL><DT><B>Returns:</B><DD>an enumeration of all the available options</DL></DD></DL><HR><A NAME="setOptions(java.lang.String[])"><!-- --></A><H3>setOptions</H3><PRE>public void <B>setOptions</B>(java.lang.String[] options) throws java.lang.Exception</PRE><DL><DD>Parses a given list of options.<DD><DL><DT><B>Specified by: </B><DD><CODE><A HREF="../../../weka/core/OptionHandler.html#setOptions(java.lang.String[])">setOptions</A></CODE> in interface <CODE><A HREF="../../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL></DD><DD><DL><DT><B>Parameters:</B><DD><CODE>options</CODE> - the list of options as an array of strings<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an option is not supported</DL></DD></DL><HR><A NAME="getOptions()"><!-- --></A><H3>getOptions</H3><PRE>public java.lang.String[] <B>getOptions</B>()</PRE><DL><DD>Gets the current settings of the Classifier.<DD><DL><DT><B>Specified by: </B><DD><CODE><A HREF="../../../weka/core/OptionHandler.html#getOptions()">getOptions</A></CODE> in interface <CODE><A HREF="../../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL></DD><DD><DL><DT><B>Returns:</B><DD>an array of strings suitable for passing to setOptions</DL></DD></DL><HR><A NAME="getUseLaplace()"><!-- --></A><H3>getUseLaplace</H3><PRE>public boolean <B>getUseLaplace</B>()</PRE><DL><DD>Get the value of useLaplace.<DD><DL></DL></DD><DD><DL><DT><B>Returns:</B><DD>Value of useLaplace.</DL></DD></DL><HR><A NAME="setUseLaplace(boolean)"><!-- --></A><H3>setUseLaplace</H3><PRE>public void <B>setUseLaplace</B>(boolean newuseLaplace)</PRE><DL><DD>Set the value of useLaplace.<DD><DL></DL></DD><DD><DL><DT><B>Parameters:</B><DD><CODE>newuseLaplace</CODE> - Value to assign to useLaplace.</DL></DD></DL><HR><A NAME="toString()"><!-- --></A><H3>toString</H3><PRE>public java.lang.String <B>toString</B>()</PRE><DL><DD>Returns a description of the classifier.<DD><DL><DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL></DD></DL><HR><A NAME="toSummaryString()"><!-- --></A><H3>toSummaryString</H3><PRE>public java.lang.String <B>toSummaryString</B>()</PRE><DL><DD>Returns a superconcise version of the model<DD><DL><DT><B>Specified by: </B><DD><CODE><A HREF="../../../weka/core/Summarizable.html#toSummaryString()">toSummaryString</A></CODE> in interface <CODE><A HREF="../../../weka/core/Summarizable.html">Summarizable</A></CODE></DL></DD><DD>Following copied from interface: <CODE>weka.core.Summarizable</CODE></DD><DD><DL><DT><B>Returns:</B><DD>the object summarized as a string</DL></DD></DL><HR><A NAME="measureTreeSize()"><!-- --></A><H3>measureTreeSize</H3><PRE>public double <B>measureTreeSize</B>()</PRE><DL><DD>Returns the size of the tree<DD><DL>⌨️ 快捷键说明
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