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<title>avram - a virtual machine code interpreter: D.12 mtwist</title>

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<a name="mtwist"></a>
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<tr><td valign="middle" align="left">[<a href="Additional-math-library-notes.html#Additional-math-library-notes" title="Previous section in reading order"> &lt; </a>]</td>
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<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="External-Libraries.html#External-Libraries" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
<td valign="middle" align="left">[<a href="External-Libraries.html#External-Libraries" title="Up section"> Up </a>]</td>
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<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="avram.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="avram_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Function-Index.html#Function-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="avram_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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<hr size="1">
<a name="mtwist-1"></a>
<h2 class="section">D.12 <code>mtwist</code></h2>

<p>The <code>mtwist</code> library interfaces to a random number generator
<a name="index-random-numbers"></a>
based on the Mersenne Twistor algorithm. The algorithm has good
properties but is not meant to be cryptographically secure. The
library functions are of the form
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">library('mtwist',f)
</pre></td></tr></table>

<p>where <code>f</code> is one of the followng character strings.
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">bern   u_cont   u_disc   u_path   u_enum   w_disc   w_enum
</pre></td></tr></table>

<p>Formally they are not mathematical functions because their results
depend on a pseudo-random number that is not uniquely determined by
their arguments. The numbers are generated deterministically in a
sequence starting from a seed derived from the system clock at the
time <code>avram</code> is launched, and each call uses the next number
in the sequence. In so doing, it simulates a random draw from a
uniformly distributed population.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="mtwist-calling-conventions.html#mtwist-calling-conventions">D.12.1 <code>mtwist</code> calling conventions</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="mtwist-exceptions.html#mtwist-exceptions">D.12.2 <code>mtwist</code> exceptions</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="Additional-mtwist-notes.html#Additional-mtwist-notes">D.12.3 Additional <code>mtwist</code> notes</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>

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