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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_13) on Mon Jul 14 01:36:51 CEST 2008 --><TITLE>MathFunctions (RapidMiner Class Documentation)</TITLE><META NAME="keywords" CONTENT="com.rapidminer.tools.math.MathFunctions class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="MathFunctions (RapidMiner Class Documentation)";}</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" 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Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">com.rapidminer.tools.math</FONT><BR>Class MathFunctions</H2><PRE>java.lang.Object <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.rapidminer.tools.math.MathFunctions</B></PRE><HR><DL><DT><PRE>public class <B>MathFunctions</B><DT>extends java.lang.Object</DL></PRE><P>This class provides mathematical functions not already provided by <tt>java.lang.Math</tt>: <ul> <li><tt>tanh()</tt> : tangens hyperbolicus, <i>y = tanh(x) = (e^x - e^-x) / (e^x + e^-x)</i></li> </ul><P><P><DL><DT><B>Version:</B></DT> <DD>$Id: MathFunctions.java,v 1.6 2008/05/09 19:23:03 ingomierswa Exp $</DD><DT><B>Author:</B></DT> <DD>Ralf Klinkenberg</DD></DL><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>protected static double[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../com/rapidminer/tools/math/MathFunctions.html#DIVIDER_COEFFICIENTS_0">DIVIDER_COEFFICIENTS_0</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static double[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../com/rapidminer/tools/math/MathFunctions.html#DIVIDER_COEFFICIENTS_1">DIVIDER_COEFFICIENTS_1</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static double[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../com/rapidminer/tools/math/MathFunctions.html#DIVIDER_COEFFICIENTS_3">DIVIDER_COEFFICIENTS_3</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static double[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../com/rapidminer/tools/math/MathFunctions.html#DIVISOR_COEFFICIENTS_0">DIVISOR_COEFFICIENTS_0</A></B></CODE><BR> coefficients for polynomials used in normalInverse() to estimate normal distribution;</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static double[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../com/rapidminer/tools/math/MathFunctions.html#DIVISOR_COEFFICIENTS_1">DIVISOR_COEFFICIENTS_1</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static double[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../com/rapidminer/tools/math/MathFunctions.html#DIVISOR_COEFFICIENTS_3">DIVISOR_COEFFICIENTS_3</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static double</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../com/rapidminer/tools/math/MathFunctions.html#log2">log2</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="../../../../com/rapidminer/tools/math/MathFunctions.html#MathFunctions()">MathFunctions</A></B>()</CODE><BR> </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 double</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../com/rapidminer/tools/math/MathFunctions.html#correlation(double[], double[])">correlation</A></B>(double[] x1, double[] x2)</CODE><BR> </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="../../../../com/rapidminer/tools/math/MathFunctions.html#ld(double)">ld</A></B>(double value)</CODE><BR> This method returns the logarithmus dualis from value</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="../../../../com/rapidminer/tools/math/MathFunctions.html#normalInverse(double)">normalInverse</A></B>(double probability)</CODE><BR> Returns the value x for which the area under the normal probability density function (integrated from minus infinity to this value x) is equal to the given probability.</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="../../../../com/rapidminer/tools/math/MathFunctions.html#robustMax(double, double)">robustMax</A></B>(double m1, double m2)</CODE><BR> </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="../../../../com/rapidminer/tools/math/MathFunctions.html#robustMin(double, double)">robustMin</A></B>(double m1, double m2)</CODE><BR> </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="../../../../com/rapidminer/tools/math/MathFunctions.html#solvePolynomial(double, double[])">solvePolynomial</A></B>(double x, double[] coefficients)</CODE><BR> Solves a given polynomial at x.</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="../../../../com/rapidminer/tools/math/MathFunctions.html#tanh(double)">tanh</A></B>(double x)</CODE><BR> returns tangens hyperbolicus of <tt>x</tt>, i.e.</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="../../../../com/rapidminer/tools/math/MathFunctions.html#variance(double[], double)">variance</A></B>(double[] v, double a)</CODE><BR> </TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>⌨️ 快捷键说明
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