You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
142 lines
7.2 KiB
HTML
142 lines
7.2 KiB
HTML
4 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- This manual describes how to install and use the GNU multiple precision
|
||
|
|
arithmetic library, version 6.1.0.
|
||
|
|
|
||
|
|
Copyright 1991, 1993-2015 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document under
|
||
|
|
the terms of the GNU Free Documentation License, Version 1.3 or any later
|
||
|
|
version published by the Free Software Foundation; with no Invariant Sections,
|
||
|
|
with the Front-Cover Texts being "A GNU Manual", and with the Back-Cover
|
||
|
|
Texts being "You have freedom to copy and modify this GNU Manual, like GNU
|
||
|
|
software". A copy of the license is included in
|
||
|
|
GNU Free Documentation License. -->
|
||
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>Integer Random Numbers (GNU MP 6.1.0)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="How to install and use the GNU multiple precision arithmetic library, version 6.1.0.">
|
||
|
|
<meta name="keywords" content="Integer Random Numbers (GNU MP 6.1.0)">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||
|
|
<link href="index.html#Top" rel="start" title="Top">
|
||
|
|
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
|
||
|
|
<link href="Integer-Functions.html#Integer-Functions" rel="up" title="Integer Functions">
|
||
|
|
<link href="Integer-Import-and-Export.html#Integer-Import-and-Export" rel="next" title="Integer Import and Export">
|
||
|
|
<link href="I_002fO-of-Integers.html#I_002fO-of-Integers" rel="prev" title="I/O of Integers">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.indentedblock {margin-right: 0em}
|
||
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
div.smalllisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style: oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smallexample {font-size: smaller}
|
||
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smalllisp {font-size: smaller}
|
||
|
|
span.nolinebreak {white-space: nowrap}
|
||
|
|
span.roman {font-family: initial; font-weight: normal}
|
||
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<a name="Integer-Random-Numbers"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="Random-Number-Functions-1"></a>
|
||
|
|
<h3 class="section">5.13 Random Number Functions</h3>
|
||
|
|
<a name="index-Integer-random-number-functions"></a>
|
||
|
|
<a name="index-Random-number-functions"></a>
|
||
|
|
|
||
|
|
<p>The random number functions of GMP come in two groups; older function
|
||
|
|
that rely on a global state, and newer functions that accept a state
|
||
|
|
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
|
||
|
|
number functions.
|
||
|
|
</p>
|
||
|
|
<dl>
|
||
|
|
<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>
|
||
|
|
<dd><p>Generate a uniformly distributed random integer in the range 0 to <em>2^<var>n</var>-1</em>, inclusive.
|
||
|
|
</p>
|
||
|
|
<p>The variable <var>state</var> must be initialized by calling one of the
|
||
|
|
<code>gmp_randinit</code> functions (<a href="Random-State-Initialization.html#Random-State-Initialization">Random State Initialization</a>) before
|
||
|
|
invoking this function.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<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>
|
||
|
|
<dd><p>Generate a uniform random integer in the range 0 to <em><var>n</var>-1</em>,
|
||
|
|
inclusive.
|
||
|
|
</p>
|
||
|
|
<p>The variable <var>state</var> must be initialized by calling one of the
|
||
|
|
<code>gmp_randinit</code> functions (<a href="Random-State-Initialization.html#Random-State-Initialization">Random State Initialization</a>)
|
||
|
|
before invoking this function.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<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>
|
||
|
|
<dd><p>Generate a random integer with long strings of zeros and ones in the
|
||
|
|
binary representation. Useful for testing functions and algorithms,
|
||
|
|
since this kind of random numbers have proven to be more likely to
|
||
|
|
trigger corner-case bugs. The random number will be in the range
|
||
|
|
0 to <em>2^<var>n</var>-1</em>, inclusive.
|
||
|
|
</p>
|
||
|
|
<p>The variable <var>state</var> must be initialized by calling one of the
|
||
|
|
<code>gmp_randinit</code> functions (<a href="Random-State-Initialization.html#Random-State-Initialization">Random State Initialization</a>)
|
||
|
|
before invoking this function.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<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>
|
||
|
|
<dd><p>Generate a random integer of at most <var>max_size</var> limbs. The generated
|
||
|
|
random number doesn’t satisfy any particular requirements of randomness.
|
||
|
|
Negative random numbers are generated when <var>max_size</var> is negative.
|
||
|
|
</p>
|
||
|
|
<p>This function is obsolete. Use <code>mpz_urandomb</code> or
|
||
|
|
<code>mpz_urandomm</code> instead.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<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>
|
||
|
|
<dd><p>Generate a random integer of at most <var>max_size</var> limbs, with long strings
|
||
|
|
of zeros and ones in the binary representation. Useful for testing functions
|
||
|
|
and algorithms, since this kind of random numbers have proven to be more
|
||
|
|
likely to trigger corner-case bugs. Negative random numbers are generated
|
||
|
|
when <var>max_size</var> is negative.
|
||
|
|
</p>
|
||
|
|
<p>This function is obsolete. Use <code>mpz_rrandomb</code> instead.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
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>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|