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100 lines
4.9 KiB
HTML
100 lines
4.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This manual describes how to install and use the GNU multiple precision
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arithmetic library, version 6.1.0.
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Copyright 1991, 1993-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document under
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the terms of the GNU Free Documentation License, Version 1.3 or any later
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version published by the Free Software Foundation; with no Invariant Sections,
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with the Front-Cover Texts being "A GNU Manual", and with the Back-Cover
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Texts being "You have freedom to copy and modify this GNU Manual, like GNU
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software". A copy of the license is included in
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GNU Free Documentation License. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Random Number Functions (GNU MP 6.1.0)</title>
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<meta name="description" content="How to install and use the GNU multiple precision arithmetic library, version 6.1.0.">
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<meta name="keywords" content="Random Number Functions (GNU MP 6.1.0)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="Random-State-Initialization.html#Random-State-Initialization" rel="next" title="Random State Initialization">
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<link href="Low_002dlevel-Functions.html#Low_002dlevel-Functions" rel="prev" title="Low-level Functions">
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<style type="text/css">
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Random-Number-Functions"></a>
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<div class="header">
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<p>
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Next: <a href="Formatted-Output.html#Formatted-Output" accesskey="n" rel="next">Formatted Output</a>, Previous: <a href="Low_002dlevel-Functions.html#Low_002dlevel-Functions" accesskey="p" rel="prev">Low-level Functions</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Random-Number-Functions-2"></a>
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<h2 class="chapter">9 Random Number Functions</h2>
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<a name="index-Random-number-functions-2"></a>
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<p>Sequences of pseudo-random numbers in GMP are generated using a variable of
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type <code>gmp_randstate_t</code>, which holds an algorithm selection and a current
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state. Such a variable must be initialized by a call to one of the
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<code>gmp_randinit</code> functions, and can be seeded with one of the
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<code>gmp_randseed</code> functions.
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</p>
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<p>The functions actually generating random numbers are described in <a href="Integer-Random-Numbers.html#Integer-Random-Numbers">Integer Random Numbers</a>, and <a href="Miscellaneous-Float-Functions.html#Miscellaneous-Float-Functions">Miscellaneous Float Functions</a>.
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</p>
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<p>The older style random number functions don’t accept a <code>gmp_randstate_t</code>
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parameter but instead share a global variable of that type. They use a
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default algorithm and are currently not seeded (though perhaps that will
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change in the future). The new functions accepting a <code>gmp_randstate_t</code>
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are recommended for applications that care about randomness.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Random-State-Initialization.html#Random-State-Initialization" accesskey="1">Random State Initialization</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Random-State-Seeding.html#Random-State-Seeding" accesskey="2">Random State Seeding</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Random-State-Miscellaneous.html#Random-State-Miscellaneous" accesskey="3">Random State Miscellaneous</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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</body>
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</html>
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