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<a name="Random-Number-Generation"></a>
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<p>
Next: <a href="Quasi_002dRandom-Sequences.html#Quasi_002dRandom-Sequences" accesskey="n" rel="next">Quasi-Random Sequences</a>, Previous: <a href="Numerical-Integration.html#Numerical-Integration" accesskey="p" rel="previous">Numerical Integration</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Random-Number-Generation-1"></a>
<h2 class="chapter">18 Random Number Generation</h2>
<a name="index-random-number-generators"></a>

<p>The library provides a large collection of random number generators
which can be accessed through a uniform interface.  Environment
variables allow you to select different generators and seeds at runtime,
so that you can easily switch between generators without needing to
recompile your program.  Each instance of a generator keeps track of its
own state, allowing the generators to be used in multi-threaded
programs.  Additional functions are available for transforming uniform
random numbers into samples from continuous or discrete probability
distributions such as the Gaussian, log-normal or Poisson distributions.
</p>
<p>These functions are declared in the header file <samp>gsl_rng.h</samp>.
</p>

<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="General-comments-on-random-numbers.html#General-comments-on-random-numbers" accesskey="1">General comments on random numbers</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="The-Random-Number-Generator-Interface.html#The-Random-Number-Generator-Interface" accesskey="2">The Random Number Generator Interface</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Random-number-generator-initialization.html#Random-number-generator-initialization" accesskey="3">Random number generator initialization</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Sampling-from-a-random-number-generator.html#Sampling-from-a-random-number-generator" accesskey="4">Sampling from a random number generator</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Auxiliary-random-number-generator-functions.html#Auxiliary-random-number-generator-functions" accesskey="5">Auxiliary random number generator functions</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Random-number-environment-variables.html#Random-number-environment-variables" accesskey="6">Random number environment variables</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Copying-random-number-generator-state.html#Copying-random-number-generator-state" accesskey="7">Copying random number generator state</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Reading-and-writing-random-number-generator-state.html#Reading-and-writing-random-number-generator-state" accesskey="8">Reading and writing random number generator state</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Random-number-generator-algorithms.html#Random-number-generator-algorithms" accesskey="9">Random number generator algorithms</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Unix-random-number-generators.html#Unix-random-number-generators">Unix random number generators</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Other-random-number-generators.html#Other-random-number-generators">Other random number generators</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Random-Number-Generator-Performance.html#Random-Number-Generator-Performance">Random Number Generator Performance</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Random-Number-Generator-Examples.html#Random-Number-Generator-Examples">Random Number Generator Examples</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Random-Number-References-and-Further-Reading.html#Random-Number-References-and-Further-Reading">Random Number References and Further Reading</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Random-Number-Acknowledgements.html#Random-Number-Acknowledgements">Random Number Acknowledgements</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>

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Next: <a href="Quasi_002dRandom-Sequences.html#Quasi_002dRandom-Sequences" accesskey="n" rel="next">Quasi-Random Sequences</a>, Previous: <a href="Numerical-Integration.html#Numerical-Integration" accesskey="p" rel="previous">Numerical Integration</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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