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<a href="#pub-methods">Public Member Functions</a> </div>
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<div class="title">OBRandom Class Reference</div> </div>
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<!-- doxytag: class="OpenBabel::OBRandom" -->
<p><code>#include <<a class="el" href="rand_8h_source.shtml">openbabel/rand.h</a>></code></p>
<p><a href="classOpenBabel_1_1OBRandom-members.shtml">List of all members.</a></p>
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<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classOpenBabel_1_1OBRandom.shtml#aad105f775b284c16fdd4c649e227335f">OBRandom</a> (bool useSys=false)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classOpenBabel_1_1OBRandom.shtml#a381897e3c19642c65d3784c94f3572d8">Seed</a> (int seed)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classOpenBabel_1_1OBRandom.shtml#a74c6a2f3418f559a3c829177885c3b59">TimeSeed</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOpenBabel_1_1OBRandom.shtml#a0fffdba613d757a821b059d7d4a26b74">NextInt</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classOpenBabel_1_1OBRandom.shtml#ae07ab97904e47280d8dfa4164ffe6bc3">NextFloat</a> ()</td></tr>
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<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Random number generator. </p>
<p>The <a class="el" href="classOpenBabel_1_1OBRandom.shtml" title="Random number generator.">OBRandom</a> class can be used to facilitate cross-platform random number generation. The class can be set to specific seed states, or set to use the current time or other arbitrary data as a seed.</p>
<div class="fragment"><pre class="fragment"> <a class="code" href="classOpenBabel_1_1OBRandom.shtml#aad105f775b284c16fdd4c649e227335f" title="Constructor. useSys will use the system rand() function.">OBRandom</a> generator; <span class="comment">// Don't use system rand() functions</span>
generator.TimeSeed(); <span class="comment">// initialize from the current time</span>
cerr << <span class="stringliteral">" New Random Integer "</span> << generator.NextInt() << endl;
cerr << <span class="stringliteral">" New Random Floating-Point "</span> << generator.NextFloat() << endl;
</pre></div><p>Alternatively, <a class="el" href="classOpenBabel_1_1OBRandom.shtml" title="Random number generator.">OBRandom</a> can be used as an interface to the system random number generator.</p>
<div class="fragment"><pre class="fragment"> <a class="code" href="classOpenBabel_1_1OBRandom.shtml#aad105f775b284c16fdd4c649e227335f" title="Constructor. useSys will use the system rand() function.">OBRandom</a> generator(<span class="keyword">true</span>); <span class="comment">// Use system rand() functions</span>
generator.Seed(10246);<span class="comment">// Use a specific initial seed value for reproducing sequence</span>
</pre></div> </div><hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="aad105f775b284c16fdd4c649e227335f"></a><!-- doxytag: member="OpenBabel::OBRandom::OBRandom" ref="aad105f775b284c16fdd4c649e227335f" args="(bool useSys=false)" -->
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<td class="memname"><a class="el" href="classOpenBabel_1_1OBRandom.shtml">OBRandom</a> </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"><em>useSys</em> = <code>false</code></td><td>)</td>
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<p>Constructor. <code>useSys</code> will use the system rand() function. </p>
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<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a381897e3c19642c65d3784c94f3572d8"></a><!-- doxytag: member="OpenBabel::OBRandom::Seed" ref="a381897e3c19642c65d3784c94f3572d8" args="(int seed)" -->
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<td class="memname">void Seed </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>seed</em></td><td>)</td>
<td><code> [inline]</code></td>
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<p>Use <code>seed</code> for the random number generator seed. </p>
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<a class="anchor" id="a74c6a2f3418f559a3c829177885c3b59"></a><!-- doxytag: member="OpenBabel::OBRandom::TimeSeed" ref="a74c6a2f3418f559a3c829177885c3b59" args="()" -->
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<td class="memname">void TimeSeed </td>
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<td class="paramname"></td><td>)</td>
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<p>Use the current time for the random number generator seed If sranddev is available (e.g., Mac OS X, BSD...) use this instead for more random seeds </p>
<p>Referenced by <a class="el" href="classOpenBabel_1_1OBForceField.shtml#ae9f7de4324a4a476ca0663772c1a6bfa">OBForceField::GenerateVelocities()</a>, <a class="el" href="classOpenBabel_1_1OBForceField.shtml#a3511ce0631f467170ac6d5a9c6d5edde">OBForceField::RandomRotorSearchInitialize()</a>, <a class="el" href="classOpenBabel_1_1vector3.shtml#af2f4c0b08630beda575c1c8697b8fece">vector3::randomUnitVector()</a>, <a class="el" href="classOpenBabel_1_1OBConformerSearch.shtml#a9084f759abbf98766f3fed69c14b568a">OBConformerSearch::Setup()</a>, and <a class="el" href="classOpenBabel_1_1OBForceField.shtml#aabf7fa941ffdd2106f5f82f2afefa33f">OBForceField::WeightedRotorSearch()</a>.</p>
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<td class="memname">int NextInt </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>a random integer </dd></dl>
<p>Referenced by <a class="el" href="classOpenBabel_1_1OBForceField.shtml#a3511ce0631f467170ac6d5a9c6d5edde">OBForceField::RandomRotorSearchInitialize()</a>, and <a class="el" href="classOpenBabel_1_1OBConformerSearch.shtml#a9084f759abbf98766f3fed69c14b568a">OBConformerSearch::Setup()</a>.</p>
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<a class="anchor" id="ae07ab97904e47280d8dfa4164ffe6bc3"></a><!-- doxytag: member="OpenBabel::OBRandom::NextFloat" ref="ae07ab97904e47280d8dfa4164ffe6bc3" args="()" -->
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<td class="memname">double NextFloat </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>a random floating-point number between 0.0 and 1.0 </dd></dl>
<p>Referenced by <a class="el" href="classOpenBabel_1_1OBForceField.shtml#ae9f7de4324a4a476ca0663772c1a6bfa">OBForceField::GenerateVelocities()</a>, <a class="el" href="classOpenBabel_1_1matrix3x3.shtml#aff25b8b63c0aec5f2c83d0cb70ae55cb">matrix3x3::randomRotation()</a>, <a class="el" href="classOpenBabel_1_1vector3.shtml#af2f4c0b08630beda575c1c8697b8fece">vector3::randomUnitVector()</a>, and <a class="el" href="classOpenBabel_1_1OBForceField.shtml#aabf7fa941ffdd2106f5f82f2afefa33f">OBForceField::WeightedRotorSearch()</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="rand_8h_source.shtml">rand.h</a></li>
<li><a class="el" href="rand_8cpp.shtml">rand.cpp</a></li>
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