costmatrix.html

由java开发的软件包

 
<P>

<!-- ============ FIELD DETAIL =========== -->

<A NAME="field_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Field Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="FILE_EXTENSION"><!-- --></A><H3>
FILE_EXTENSION</H3>
<PRE>
public static java.lang.String <B>FILE_EXTENSION</B></PRE>
<DL>
<DD>The deafult file extension for cost matrix files
<P>
<DL>
</DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="CostMatrix(weka.classifiers.CostMatrix)"><!-- --></A><H3>
CostMatrix</H3>
<PRE>
public <B>CostMatrix</B>(<A HREF="../../weka/classifiers/CostMatrix.html" title="class in weka.classifiers">CostMatrix</A>&nbsp;toCopy)</PRE>
<DL>
<DD>Creates a cost matrix that is a copy of another.
<P>
<DT><B>Parameters:</B><DD><CODE>toCopy</CODE> - the matrix to copy.</DL>
<HR>

<A NAME="CostMatrix(int)"><!-- --></A><H3>
CostMatrix</H3>
<PRE>
public <B>CostMatrix</B>(int&nbsp;numOfClasses)</PRE>
<DL>
<DD>Creates a default cost matrix of a particular size. All values will be 0.
<P>
<DT><B>Parameters:</B><DD><CODE>numOfClasses</CODE> - the number of classes that the cost matrix holds.</DL>
<HR>

<A NAME="CostMatrix(java.io.Reader)"><!-- --></A><H3>
CostMatrix</H3>
<PRE>
public <B>CostMatrix</B>(java.io.Reader&nbsp;reader)
           throws java.lang.Exception</PRE>
<DL>
<DD>Creates a cost matrix from a reader.
<P>
<DT><B>Parameters:</B><DD><CODE>reader</CODE> - the reader to get the values from.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the matrix is invalid.</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="initialize()"><!-- --></A><H3>
initialize</H3>
<PRE>
public void <B>initialize</B>()</PRE>
<DL>
<DD>Sets the cost of all correct classifications to 0, and all
 misclassifications to 1.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="size()"><!-- --></A><H3>
size</H3>
<PRE>
public int <B>size</B>()</PRE>
<DL>
<DD>Gets the size of the matrix.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the size.</DL>
</DD>
</DL>
<HR>

<A NAME="applyCostMatrix(weka.core.Instances, java.util.Random)"><!-- --></A><H3>
applyCostMatrix</H3>
<PRE>
public <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>applyCostMatrix</B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;data,
                                 java.util.Random&nbsp;random)
                          throws java.lang.Exception</PRE>
<DL>
<DD>Applies the cost matrix to a set of instances. If a random number generator is 
 supplied the instances will be resampled, otherwise they will be rewighted. 
 Adapted from code once sitting in Instances.java
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - the instances to reweight.<DD><CODE>random</CODE> - a random number generator for resampling, if null then instances are
 rewighted.
<DT><B>Returns:</B><DD>a new dataset reflecting the cost of misclassification.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the data has no class or the matrix in inappropriate.</DL>
</DD>
</DL>
<HR>

<A NAME="expectedCosts(double[])"><!-- --></A><H3>
expectedCosts</H3>
<PRE>
public double[] <B>expectedCosts</B>(double[]&nbsp;classProbs)
                       throws java.lang.Exception</PRE>
<DL>
<DD>Calculates the expected misclassification cost for each possible class value,
 given class probability estimates.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>classProbs</CODE> - the class probability estimates.
<DT><B>Returns:</B><DD>the expected costs.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the wrong number of class probabilities is supplied.</DL>
</DD>
</DL>
<HR>

<A NAME="getMaxCost(int)"><!-- --></A><H3>
getMaxCost</H3>
<PRE>
public double <B>getMaxCost</B>(int&nbsp;classVal)</PRE>
<DL>
<DD>Gets the maximum cost for a particular class value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>classVal</CODE> - the class value.
<DT><B>Returns:</B><DD>the maximum cost.</DL>
</DD>
</DL>
<HR>

<A NAME="normalize()"><!-- --></A><H3>
normalize</H3>
<PRE>
public void <B>normalize</B>()</PRE>
<DL>
<DD>Normalizes the matrix so that the diagonal contains zeros.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="readOldFormat(java.io.Reader)"><!-- --></A><H3>
readOldFormat</H3>
<PRE>
public void <B>readOldFormat</B>(java.io.Reader&nbsp;reader)
                   throws java.lang.Exception</PRE>
<DL>
<DD>Loads a cost matrix in the old format from a reader. Adapted from code once sitting 
 in Instances.java
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>reader</CODE> - the reader to get the values from.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the matrix cannot be read correctly.</DL>
</DD>
</DL>
<!-- ========= END OF CLASS DATA ========= -->
<HR>


<!-- ======= START OF BOTTOM NAVBAR ====== -->
<A NAME="navbar_bottom"><!-- --></A>
<A HREF="#skip-navbar_bottom" title="Skip navigation links"></A>
<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY="">
<TR>
<TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
<A NAME="navbar_bottom_firstrow"><!-- --></A>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
  <TR ALIGN="center" VALIGN="top">
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../Tutorial.pdf"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="http://www.cs.waikato.ac.nz/ml/weka/index.html"><FONT CLASS="NavBarFont1"><B>Weka's home</B></FONT></A>&nbsp;</TD>
  </TR>
</TABLE>
</TD>
<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
</EM>
</TD>
</TR>

<TR>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
&nbsp;<A HREF="../../weka/classifiers/Classifier.html" title="class in weka.classifiers"><B>PREV CLASS</B></A>&nbsp;
&nbsp;<A HREF="../../weka/classifiers/Evaluation.html" title="class in weka.classifiers"><B>NEXT CLASS</B></A></FONT></TD>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
  <A HREF="../../index.html" target="_top"><B>FRAMES</B></A>  &nbsp;
&nbsp;<A HREF="CostMatrix.html" target="_top"><B>NO FRAMES</B></A>  &nbsp;
&nbsp;<SCRIPT type="text/javascript">
  <!--
  if(window==top) {
    document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>');
  }
  //-->
</SCRIPT>
<NOSCRIPT>
  <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>
</NOSCRIPT>

</FONT></TD>
</TR>
<TR>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
DETAIL:&nbsp;<A HREF="#field_detail">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_detail">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
</TR>
</TABLE>
<A NAME="skip-navbar_bottom"></A>
<!-- ======== END OF BOTTOM NAVBAR ======= -->

<HR>

</BODY>
</HTML>