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142 lines
7.2 KiB
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142 lines
7.2 KiB
HTML
<!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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software". A copy of the license is included in
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GNU Free Documentation License. -->
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<head>
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<title>Integer Random Numbers (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="Integer Random Numbers (GNU MP 6.1.0)">
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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="Integer-Functions.html#Integer-Functions" rel="up" title="Integer Functions">
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<link href="Integer-Import-and-Export.html#Integer-Import-and-Export" rel="next" title="Integer Import and Export">
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</head>
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<body lang="en">
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<a name="Integer-Random-Numbers"></a>
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<div class="header">
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<p>
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Next: <a href="Integer-Import-and-Export.html#Integer-Import-and-Export" accesskey="n" rel="next">Integer Import and Export</a>, Previous: <a href="I_002fO-of-Integers.html#I_002fO-of-Integers" accesskey="p" rel="prev">I/O of Integers</a>, Up: <a href="Integer-Functions.html#Integer-Functions" accesskey="u" rel="up">Integer Functions</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-1"></a>
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<h3 class="section">5.13 Random Number Functions</h3>
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<a name="index-Integer-random-number-functions"></a>
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<a name="index-Random-number-functions"></a>
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<p>The random number functions of GMP come in two groups; older function
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that rely on a global state, and newer functions that accept a state
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parameter that is read and modified. Please see the <a href="Random-Number-Functions.html#Random-Number-Functions">Random Number Functions</a> for more information on how to use and not to use random
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number functions.
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</p>
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<dl>
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<dt><a name="index-mpz_005furandomb"></a>Function: <em>void</em> <strong>mpz_urandomb</strong> <em>(mpz_t <var>rop</var>, gmp_randstate_t <var>state</var>, mp_bitcnt_t <var>n</var>)</em></dt>
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<dd><p>Generate a uniformly distributed random integer in the range 0 to <em>2^<var>n</var>-1</em>, inclusive.
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</p>
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<p>The variable <var>state</var> must be initialized by calling one of the
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<code>gmp_randinit</code> functions (<a href="Random-State-Initialization.html#Random-State-Initialization">Random State Initialization</a>) before
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invoking this function.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpz_005furandomm"></a>Function: <em>void</em> <strong>mpz_urandomm</strong> <em>(mpz_t <var>rop</var>, gmp_randstate_t <var>state</var>, const mpz_t <var>n</var>)</em></dt>
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<dd><p>Generate a uniform random integer in the range 0 to <em><var>n</var>-1</em>,
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inclusive.
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</p>
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<p>The variable <var>state</var> must be initialized by calling one of the
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<code>gmp_randinit</code> functions (<a href="Random-State-Initialization.html#Random-State-Initialization">Random State Initialization</a>)
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before invoking this function.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpz_005frrandomb"></a>Function: <em>void</em> <strong>mpz_rrandomb</strong> <em>(mpz_t <var>rop</var>, gmp_randstate_t <var>state</var>, mp_bitcnt_t <var>n</var>)</em></dt>
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<dd><p>Generate a random integer with long strings of zeros and ones in the
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binary representation. Useful for testing functions and algorithms,
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since this kind of random numbers have proven to be more likely to
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trigger corner-case bugs. The random number will be in the range
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0 to <em>2^<var>n</var>-1</em>, inclusive.
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</p>
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<p>The variable <var>state</var> must be initialized by calling one of the
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<code>gmp_randinit</code> functions (<a href="Random-State-Initialization.html#Random-State-Initialization">Random State Initialization</a>)
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before invoking this function.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpz_005frandom"></a>Function: <em>void</em> <strong>mpz_random</strong> <em>(mpz_t <var>rop</var>, mp_size_t <var>max_size</var>)</em></dt>
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<dd><p>Generate a random integer of at most <var>max_size</var> limbs. The generated
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random number doesn’t satisfy any particular requirements of randomness.
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Negative random numbers are generated when <var>max_size</var> is negative.
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</p>
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<p>This function is obsolete. Use <code>mpz_urandomb</code> or
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<code>mpz_urandomm</code> instead.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpz_005frandom2"></a>Function: <em>void</em> <strong>mpz_random2</strong> <em>(mpz_t <var>rop</var>, mp_size_t <var>max_size</var>)</em></dt>
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<dd><p>Generate a random integer of at most <var>max_size</var> limbs, with long strings
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of zeros and ones in the binary representation. Useful for testing functions
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and algorithms, since this kind of random numbers have proven to be more
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likely to trigger corner-case bugs. Negative random numbers are generated
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when <var>max_size</var> is negative.
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</p>
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<p>This function is obsolete. Use <code>mpz_rrandomb</code> instead.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Integer-Import-and-Export.html#Integer-Import-and-Export" accesskey="n" rel="next">Integer Import and Export</a>, Previous: <a href="I_002fO-of-Integers.html#I_002fO-of-Integers" accesskey="p" rel="prev">I/O of Integers</a>, Up: <a href="Integer-Functions.html#Integer-Functions" accesskey="u" rel="up">Integer Functions</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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