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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 1.6.0_17) on Sat Mar 27 22:46:16 EDT 2010 --> <META http-equiv="Content-Type" content="text/html; charset=UTF-8"> <TITLE> RandomGenerator (Commons Math 2.1 API) </TITLE> <META NAME="date" CONTENT="2010-03-27"> <LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../../stylesheet.css" TITLE="Style"> <SCRIPT type="text/javascript"> function windowTitle() { if (location.href.indexOf('is-external=true') == -1) { parent.document.title="RandomGenerator (Commons Math 2.1 API)"; } } </SCRIPT> <NOSCRIPT> </NOSCRIPT> </HEAD> <BODY BGCOLOR="white" onload="windowTitle();"> <HR> <!-- ========= 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="../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <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="class-use/RandomGenerator.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </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="../../../../../org/apache/commons/math/random/RandomDataImpl.html" title="class in org.apache.commons.math.random"><B>PREV CLASS</B></A> <A HREF="../../../../../org/apache/commons/math/random/RandomVectorGenerator.html" title="interface in org.apache.commons.math.random"><B>NEXT CLASS</B></A></FONT></TD> <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../index.html?org/apache/commons/math/random/RandomGenerator.html" target="_top"><B>FRAMES</B></A> <A HREF="RandomGenerator.html" target="_top"><B>NO FRAMES</B></A> <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: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD> <TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> DETAIL: FIELD | CONSTR | <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"> org.apache.commons.math.random</FONT> <BR> Interface RandomGenerator</H2> <DL> <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/apache/commons/math/random/AbstractRandomGenerator.html" title="class in org.apache.commons.math.random">AbstractRandomGenerator</A>, <A HREF="../../../../../org/apache/commons/math/random/BitsStreamGenerator.html" title="class in org.apache.commons.math.random">BitsStreamGenerator</A>, <A HREF="../../../../../org/apache/commons/math/random/JDKRandomGenerator.html" title="class in org.apache.commons.math.random">JDKRandomGenerator</A>, <A HREF="../../../../../org/apache/commons/math/random/MersenneTwister.html" title="class in org.apache.commons.math.random">MersenneTwister</A>, <A HREF="../../../../../org/apache/commons/math/random/RandomAdaptor.html" title="class in org.apache.commons.math.random">RandomAdaptor</A></DD> </DL> <HR> <DL> <DT><PRE>public interface <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.27"><B>RandomGenerator</B></A></DL> </PRE> <P> Interface extracted from <code>java.util.Random</code>. This interface is implemented by <A HREF="../../../../../org/apache/commons/math/random/AbstractRandomGenerator.html" title="class in org.apache.commons.math.random"><CODE>AbstractRandomGenerator</CODE></A>. <P> <P> <DL> <DT><B>Since:</B></DT> <DD>1.1</DD> <DT><B>Version:</B></DT> <DD>$Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $</DD> </DL> <HR> <P> <!-- ========== 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> boolean</CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../../org/apache/commons/math/random/RandomGenerator.html#nextBoolean()">nextBoolean</A></B>()</CODE> <BR> Returns the next pseudorandom, uniformly distributed <code>boolean</code> value from this random number generator's sequence.</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="../../../../../org/apache/commons/math/random/RandomGenerator.html#nextBytes(byte[])">nextBytes</A></B>(byte[] bytes)</CODE> <BR> Generates random bytes and places them into a user-supplied byte array.</TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> <CODE> double</CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../../org/apache/commons/math/random/RandomGenerator.html#nextDouble()">nextDouble</A></B>()</CODE> <BR> Returns the next pseudorandom, uniformly distributed <code>double</code> value between <code>0.0</code> and <code>1.0</code> from this random number generator's sequence.</TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> <CODE> float</CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../../org/apache/commons/math/random/RandomGenerator.html#nextFloat()">nextFloat</A></B>()</CODE> <BR> Returns the next pseudorandom, uniformly distributed <code>float</code> value between <code>0.0</code> and <code>1.0</code> from this random number generator's sequence.</TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> <CODE> double</CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../../org/apache/commons/math/random/RandomGenerator.html#nextGaussian()">nextGaussian</A></B>()</CODE> <BR> Returns the next pseudorandom, Gaussian ("normally") distributed <code>double</code> value with mean <code>0.0</code> and standard deviation <code>1.0</code> from this random number generator's sequence.</TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> <CODE> int</CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../../org/apache/commons/math/random/RandomGenerator.html#nextInt()">nextInt</A></B>()</CODE> <BR> Returns the next pseudorandom, uniformly distributed <code>int</code> value from this random number generator's sequence.</TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> <CODE> int</CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../../org/apache/commons/math/random/RandomGenerator.html#nextInt(int)">nextInt</A></B>(int n)</CODE> <BR> Returns a pseudorandom, uniformly distributed <tt>int</tt> value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.</TD> </TR> <TR BGCOLOR="white" CLASS="TableRowColor"> <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> <CODE> long</CODE></FONT></TD> <TD><CODE><B><A HREF="../../../../../org/apache/commons/math/random/RandomGenerator.html#nextLong()">nextLong</A></B>()</CODE> <BR> Returns the next pseudorandom, uniformly distributed <code>long</code> value from this random number generator's sequence.</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="../../../../../org/apache/commons/math/random/RandomGenerator.html#setSeed(int)">setSeed</A></B>(int seed)</CODE> <BR> Sets the seed of the underyling random number generator using an <code>int</code> seed.</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="../../../../../org/apache/commons/math/random/RandomGenerator.html#setSeed(int[])">setSeed</A></B>(int[] seed)</CODE> <BR> Sets the seed of the underyling random number generator using an <code>int</code> array seed.</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="../../../../../org/apache/commons/math/random/RandomGenerator.html#setSeed(long)">setSeed</A></B>(long seed)</CODE> <BR> Sets the seed of the underyling random number generator using a <code>long</code> seed.</TD> </TR> </TABLE> <P> <!-- ============ METHOD DETAIL ========== --> <A NAME="method_detail"><!-- --></A> <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> <B>Method Detail</B></FONT></TH> </TR> </TABLE> <A NAME="setSeed(int)"><!-- --></A><H3> setSeed</H3> <PRE> void <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.37"><B>setSeed</B></A>(int seed)</PRE> <DL> <DD>Sets the seed of the underyling random number generator using an <code>int</code> seed. <p>Sequences of values generated starting with the same seeds should be identical. </p> <P> <DD><DL> <DT><B>Parameters:</B><DD><CODE>seed</CODE> - the seed value</DL> </DD> </DL> <HR> <A NAME="setSeed(int[])"><!-- --></A><H3> setSeed</H3> <PRE> void <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.47"><B>setSeed</B></A>(int[] seed)</PRE> <DL> <DD>Sets the seed of the underyling random number generator using an <code>int</code> array seed. <p>Sequences of values generated starting with the same seeds should be identical. </p> <P> <DD><DL> <DT><B>Parameters:</B><DD><CODE>seed</CODE> - the seed value</DL> </DD> </DL> <HR> <A NAME="setSeed(long)"><!-- --></A><H3> setSeed</H3> <PRE> void <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.57"><B>setSeed</B></A>(long seed)</PRE> <DL> <DD>Sets the seed of the underyling random number generator using a <code>long</code> seed. <p>Sequences of values generated starting with the same seeds should be identical. </p> <P> <DD><DL> <DT><B>Parameters:</B><DD><CODE>seed</CODE> - the seed value</DL> </DD> </DL> <HR> <A NAME="nextBytes(byte[])"><!-- --></A><H3> nextBytes</H3> <PRE> void <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.67"><B>nextBytes</B></A>(byte[] bytes)</PRE> <DL> <DD>Generates random bytes and places them into a user-supplied byte array. The number of random bytes produced is equal to the length of the byte array. <P> <DD><DL> <DT><B>Parameters:</B><DD><CODE>bytes</CODE> - the non-null byte array in which to put the random bytes</DL> </DD> </DL> <HR> <A NAME="nextInt()"><!-- --></A><H3> nextInt</H3> <PRE> int <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.78"><B>nextInt</B></A>()</PRE> <DL> <DD>Returns the next pseudorandom, uniformly distributed <code>int</code> value from this random number generator's sequence. All 2<font size="-1"><sup>32</sup></font> possible <tt>int</tt> values should be produced with (approximately) equal probability. <P> <DD><DL> <DT><B>Returns:</B><DD>the next pseudorandom, uniformly distributed <code>int</code> value from this random number generator's sequence</DL> </DD> </DL> <HR> <A NAME="nextInt(int)"><!-- --></A><H3> nextInt</H3> <PRE> int <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.91"><B>nextInt</B></A>(int n)</PRE> <DL> <DD>Returns a pseudorandom, uniformly distributed <tt>int</tt> value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence. <P> <DD><DL> <DT><B>Parameters:</B><DD><CODE>n</CODE> - the bound on the random number to be returned. Must be positive. <DT><B>Returns:</B><DD>a pseudorandom, uniformly distributed <tt>int</tt> value between 0 (inclusive) and n (exclusive). <DT><B>Throws:</B> <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if n is not positive.</DL> </DD> </DL> <HR> <A NAME="nextLong()"><!-- --></A><H3> nextLong</H3> <PRE> long <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.102"><B>nextLong</B></A>()</PRE> <DL> <DD>Returns the next pseudorandom, uniformly distributed <code>long</code> value from this random number generator's sequence. All 2<font size="-1"><sup>64</sup></font> possible <tt>long</tt> values should be produced with (approximately) equal probability. <P> <DD><DL> <DT><B>Returns:</B><DD>the next pseudorandom, uniformly distributed <code>long</code> value from this random number generator's sequence</DL> </DD> </DL> <HR> <A NAME="nextBoolean()"><!-- --></A><H3> nextBoolean</H3> <PRE> boolean <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.113"><B>nextBoolean</B></A>()</PRE> <DL> <DD>Returns the next pseudorandom, uniformly distributed <code>boolean</code> value from this random number generator's sequence. <P> <DD><DL> <DT><B>Returns:</B><DD>the next pseudorandom, uniformly distributed <code>boolean</code> value from this random number generator's sequence</DL> </DD> </DL> <HR> <A NAME="nextFloat()"><!-- --></A><H3> nextFloat</H3> <PRE> float <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.124"><B>nextFloat</B></A>()</PRE> <DL> <DD>Returns the next pseudorandom, uniformly distributed <code>float</code> value between <code>0.0</code> and <code>1.0</code> from this random number generator's sequence. <P> <DD><DL> <DT><B>Returns:</B><DD>the next pseudorandom, uniformly distributed <code>float</code> value between <code>0.0</code> and <code>1.0</code> from this random number generator's sequence</DL> </DD> </DL> <HR> <A NAME="nextDouble()"><!-- --></A><H3> nextDouble</H3> <PRE> double <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.135"><B>nextDouble</B></A>()</PRE> <DL> <DD>Returns the next pseudorandom, uniformly distributed <code>double</code> value between <code>0.0</code> and <code>1.0</code> from this random number generator's sequence. <P> <DD><DL> <DT><B>Returns:</B><DD>the next pseudorandom, uniformly distributed <code>double</code> value between <code>0.0</code> and <code>1.0</code> from this random number generator's sequence</DL> </DD> </DL> <HR> <A NAME="nextGaussian()"><!-- --></A><H3> nextGaussian</H3> <PRE> double <A HREF="../../../../../src-html/org/apache/commons/math/random/RandomGenerator.html#line.147"><B>nextGaussian</B></A>()</PRE> <DL> <DD>Returns the next pseudorandom, Gaussian ("normally") distributed <code>double</code> value with mean <code>0.0</code> and standard deviation <code>1.0</code> from this random number generator's sequence. <P> <DD><DL> <DT><B>Returns:</B><DD>the next pseudorandom, Gaussian ("normally") distributed <code>double</code> value with mean <code>0.0</code> and standard deviation <code>1.0</code> from this random number generator's sequence</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=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A 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