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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_03) on Fri Jun 03 16:24:23 CDT 2005 --><TITLE>MathUtil</TITLE><META NAME="keywords" CONTENT="MathUtil class"><LINK REL ="stylesheet" TYPE="text/css" HREF="stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="MathUtil";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="MainMenu.html" title="class in <Unnamed>"><B>PREV CLASS</B></A> <A HREF="Matrix.html" title="class in <Unnamed>"><B>NEXT CLASS</B></A></FONT></TD><TD 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<IMG SRC="./resources/inherit.gif" ALT="extended by "><B>MathUtil</B></PRE><HR><DL><DT><PRE>public class <B>MathUtil</B><DT>extends java.lang.Object</DL></PRE><P>class that round off floating point numbers to the specified number of decimal places givem<P><P><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Field Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static long</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#RAND_SEED">RAND_SEED</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static java.util.Random</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#random">random</A></B></CODE><BR> </TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="MathUtil.html#MathUtil()">MathUtil</A></B>()</CODE><BR> Default constructor.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static boolean</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#almostEqual(double, double)">almostEqual</A></B>(double val1, double val2)</CODE><BR> method sees if input doubles are "almost" equal</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static boolean</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#almostEqual(java.util.Vector, double)">almostEqual</A></B>(java.util.Vector vec1, double val2)</CODE><BR> method sees if input vectors are "almost" equal</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static boolean</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#almostEqual(java.util.Vector, java.util.Vector)">almostEqual</A></B>(java.util.Vector vec1, java.util.Vector vec2)</CODE><BR> method sees if input vectors are "almost" equal</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static void</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#betweenClass(DataPoints, Matrix, double, double)">betweenClass</A></B>(<A HREF="DataPoints.html" title="class in <Unnamed>">DataPoints</A> d, <A HREF="Matrix.html" title="class in <Unnamed>">Matrix</A> M, double rx_a, double ry_a)</CODE><BR> this method determines the between class scatter matrix for the class independent linear discrimination algorithm</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="MyPoint.html" title="class in <Unnamed>">MyPoint</A></CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#computeClusterMean(java.util.Vector)">computeClusterMean</A></B>(java.util.Vector vec)</CODE><BR> methods computes and returns the mean of the given cluster</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="MyPoint.html" title="class in <Unnamed>">MyPoint</A></CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#computeMyPointMean(java.util.Vector)">computeMyPointMean</A></B>(java.util.Vector vec)</CODE><BR> methods computes and returns the mean of the given cluster</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="MyPoint.html" title="class in <Unnamed>">MyPoint</A></CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#computePointMean(java.util.Vector)">computePointMean</A></B>(java.util.Vector vec)</CODE><BR> methods computes and returns the mean of the given cluster</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static void</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#copyVector(java.util.Vector, java.util.Vector, int, int, int)">copyVector</A></B>(java.util.Vector<java.lang.Double> vec1_a, java.util.Vector<java.lang.Double> vec2_a, int length_a, int index1_a, int index2_a)</CODE><BR> Copies vector given specific parameters</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#distance(double, double, double, double)">distance</A></B>(double x1, double y1, double x2, double y2)</CODE><BR> calculate the euclidean distance between the two points</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#doubleValue(java.util.Vector, int)">doubleValue</A></B>(java.util.Vector<java.lang.Double> vec_a, int index_a)</CODE><BR> gets the double value of the input vector at the index passed</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static double</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#grand(double, double)">grand</A></B>(double mean, double stddev)</CODE><BR> method generates a random distribution centered about the mean with a variance that is specified by the standard deviation.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static void</CODE></FONT></TD><TD><CODE><B><A HREF="MathUtil.html#initDoubleVector(java.util.Vector, double)">initDoubleVector</A></B>(java.util.Vector<java.lang.Double> vec_a, double value_a)</CODE>⌨️ 快捷键说明
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