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<h1>Random123/gsl_microrng.h File Reference</h1> </div>
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<code>#include <gsl/gsl_rng.h></code><br/>
<code>#include <string.h></code><br/>
<p><a href="gsl__microrng_8h_source.html">Go to the source code of this file.</a></p>
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Defines</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="gsl__microrng_8h.html#a21c7bb64a536a1704c6dc96856b78297">GSL_MICRORNG</a>(NAME, CBRNGNAME)</td></tr>
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<hr/><h2>Define Documentation</h2>
<a class="anchor" id="a21c7bb64a536a1704c6dc96856b78297"></a><!-- doxytag: member="gsl_microrng.h::GSL_MICRORNG" ref="a21c7bb64a536a1704c6dc96856b78297" args="(NAME, CBRNGNAME)" -->
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<td class="memname">#define GSL_MICRORNG</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">NAME, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">CBRNGNAME</td><td> </td>
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<td>)</td>
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<p>The macro: <a class="el" href="gsl__microrng_8h.html#a21c7bb64a536a1704c6dc96856b78297">GSL_MICRORNG(NAME, CBRNGNAME)</a> is the GSL analog analog of the C++ <a class="el" href="classr123_1_1MicroURNG.html">r123::MicroURNG</a> template. It declares a gsl_rng type named gsl_rng_NAME which uses the underlying CBRNGNAME and can be invoked a limited number of times between calls to NAME_reset.</p>
<p>When the underlying CBRNG's <code>ctr_t</code> is an <a class="el" href="group__arrayNxW.html">r123arrayNxW</a>, and the gsl_rng_NAME may called up to <code>N*2^32</code> times between calls to <code>NAME_reset</code>.</p>
<p><code>NAME_reset</code> takes a gsl_rng_NAME type, a counter and a key as arguments. It restarts the micro-rng with a new base counter and key.</p>
<p>Note that you must call NAME_reset before the first use of a gsl_rng. NAME_reset is not called automatically by gsl_rng_alloc().</p>
<div class="fragment"><pre class="fragment"><span class="preprocessor"> #include <<a class="code" href="threefry_8h.html">Random123/threefry.h</a>></span>
<span class="preprocessor"> #include <<a class="code" href="gsl__microrng_8h.html">Random123/gsl_microrng.h</a>></span> <span class="comment">// this file</span>
<a class="code" href="gsl__microrng_8h.html#a21c7bb64a536a1704c6dc96856b78297">GSL_MICRORNG</a>(microcbrng, <a class="code" href="threefry_8h.html#a992029974a22f14e0ef29a862ede2b8d">threefry4x64</a>, 20) <span class="comment">// creates gsl_rng_microcbrng</span>
int main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv) {
gsl_rng *r = gsl_rng_alloc(gsl_rng_microcbrng);
<a class="code" href="structr123array4x64.html">threefry4x64_ctr_t</a> c = {{}};
<a class="code" href="structr123array4x64.html">threefry4x64_key_t</a> k = {{}};
<span class="keywordflow">for</span> (...) {
c.<a class="code" href="structr123array4x64.html#aae3a18410877c49f1058bc4d78a62f48">v</a>[0] = ??; <span class="comment">// some application variable</span>
microcbrng_reset(r, c, k);
<span class="keywordflow">for</span> (...) {
<span class="comment">// gaussian calls r several times. It is safe for</span>
<span class="comment">// r to be used upto 2^20 times in this loop</span>
something[i] = gsl_ran_gaussian(r, 1.5);
}
}
}
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