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<title>GNU Scientific Library &ndash; Reference Manual: Copying random number generator state</title>

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<a name="Copying-random-number-generator-state"></a>
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<p>
Next: <a href="Reading-and-writing-random-number-generator-state.html#Reading-and-writing-random-number-generator-state" accesskey="n" rel="next">Reading and writing random number generator state</a>, Previous: <a href="Random-number-environment-variables.html#Random-number-environment-variables" accesskey="p" rel="previous">Random number environment variables</a>, Up: <a href="Random-Number-Generation.html#Random-Number-Generation" accesskey="u" rel="up">Random Number Generation</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Copying-random-number-generator-state-1"></a>
<h3 class="section">18.7 Copying random number generator state</h3>

<p>The above methods do not expose the random number &lsquo;state&rsquo; which changes
from call to call.  It is often useful to be able to save and restore
the state.  To permit these practices, a few somewhat more advanced
functions are supplied.  These include:
</p>
<dl>
<dt><a name="index-gsl_005frng_005fmemcpy"></a>Function: <em>int</em> <strong>gsl_rng_memcpy</strong> <em>(gsl_rng * <var>dest</var>, const gsl_rng * <var>src</var>)</em></dt>
<dd><p>This function copies the random number generator <var>src</var> into the
pre-existing generator <var>dest</var>, making <var>dest</var> into an exact copy
of <var>src</var>.  The two generators must be of the same type.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005frng_005fclone"></a>Function: <em>gsl_rng *</em> <strong>gsl_rng_clone</strong> <em>(const gsl_rng * <var>r</var>)</em></dt>
<dd><p>This function returns a pointer to a newly created generator which is an
exact copy of the generator <var>r</var>.
</p></dd></dl>




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