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140 lines
7.1 KiB
HTML
140 lines
7.1 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 documents how to install and use the Multiple Precision
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Floating-Point Reliable Library, version 3.1.4.
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Copyright 1991, 1993-2016 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 1.2 or any later
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version published by the Free Software Foundation; with no Invariant Sections,
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with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the
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license is included in 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>Compatibility with MPF (GNU MPFR 3.1.4)</title>
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<meta name="description" content="How to install and use GNU MPFR, a library for reliable multiple precision
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floating-point arithmetic, version 3.1.4.">
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<meta name="keywords" content="Compatibility with MPF (GNU MPFR 3.1.4)">
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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=utf-8">
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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="MPFR-Interface.html#MPFR-Interface" rel="up" title="MPFR Interface">
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<link href="Custom-Interface.html#Custom-Interface" rel="next" title="Custom Interface">
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<link href="Exception-Related-Functions.html#Exception-Related-Functions" rel="prev" title="Exception Related Functions">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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div.display {margin-left: 3.2em}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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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="Compatibility-with-MPF"></a>
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<div class="header">
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<p>
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Next: <a href="Custom-Interface.html#Custom-Interface" accesskey="n" rel="next">Custom Interface</a>, Previous: <a href="Exception-Related-Functions.html#Exception-Related-Functions" accesskey="p" rel="prev">Exception Related Functions</a>, Up: <a href="MPFR-Interface.html#MPFR-Interface" accesskey="u" rel="up">MPFR Interface</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="index-Compatibility-with-MPF"></a>
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<a name="Compatibility-With-MPF"></a>
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<h3 class="section">5.14 Compatibility With MPF</h3>
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<p>A header file <samp>mpf2mpfr.h</samp> is included in the distribution of MPFR for
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compatibility with the GNU MP class MPF.
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By inserting the following two lines after the <code>#include <gmp.h></code> line,
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</p><div class="example">
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<pre class="example">#include <mpfr.h>
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#include <mpf2mpfr.h>
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</pre></div>
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<p>any program written for
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MPF can be compiled directly with MPFR without any changes
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(except the <code>gmp_printf</code> functions will not work for arguments of type
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<code>mpfr_t</code>).
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All operations are then performed with the default MPFR rounding mode,
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which can be reset with <code>mpfr_set_default_rounding_mode</code>.
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</p>
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<p>Warning: the <code>mpf_init</code> and <code>mpf_init2</code> functions initialize
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to zero, whereas the corresponding MPFR functions initialize to NaN:
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this is useful to detect uninitialized values, but is slightly incompatible
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with MPF.
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</p>
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<dl>
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<dt><a name="index-mpfr_005fset_005fprec_005fraw"></a>Function: <em>void</em> <strong>mpfr_set_prec_raw</strong> <em>(mpfr_t <var>x</var>, mpfr_prec_t <var>prec</var>)</em></dt>
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<dd><p>Reset the precision of <var>x</var> to be <strong>exactly</strong> <var>prec</var> bits.
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The only difference with <code>mpfr_set_prec</code> is that <var>prec</var> is assumed to
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be small enough so that the significand fits into the current allocated memory
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space for <var>x</var>. Otherwise the behavior is undefined.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005feq"></a>Function: <em>int</em> <strong>mpfr_eq</strong> <em>(mpfr_t <var>op1</var>, mpfr_t <var>op2</var>, unsigned long int <var>op3</var>)</em></dt>
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<dd><p>Return non-zero if <var>op1</var> and <var>op2</var> are both non-zero ordinary
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numbers with the same exponent and the same first <var>op3</var> bits, both
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zero, or both infinities of the same sign. Return zero otherwise.
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This function is defined for compatibility with MPF, we do not recommend
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to use it otherwise.
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Do not use it either if
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you want to know whether two numbers are close to each other; for instance,
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1.011111 and 1.100000 are regarded as different for any value of
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<var>op3</var> larger than 1.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005freldiff"></a>Function: <em>void</em> <strong>mpfr_reldiff</strong> <em>(mpfr_t <var>rop</var>, mpfr_t <var>op1</var>, mpfr_t <var>op2</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>Compute the relative difference between <var>op1</var> and <var>op2</var>
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and store the result in <var>rop</var>.
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This function does not guarantee the correct rounding on the relative
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difference; it just computes <em>|<var>op1</var>-<var>op2</var>|/<var>op1</var></em>, using the
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precision of <var>rop</var> and the rounding mode <var>rnd</var> for all operations.
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</p></dd></dl>
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<dl>
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<dt><a name="index-mpfr_005fmul_005f2exp"></a>Function: <em>int</em> <strong>mpfr_mul_2exp</strong> <em>(mpfr_t <var>rop</var>, mpfr_t <var>op1</var>, unsigned long int <var>op2</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dt><a name="index-mpfr_005fdiv_005f2exp"></a>Function: <em>int</em> <strong>mpfr_div_2exp</strong> <em>(mpfr_t <var>rop</var>, mpfr_t <var>op1</var>, unsigned long int <var>op2</var>, mpfr_rnd_t <var>rnd</var>)</em></dt>
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<dd><p>These functions are identical to <code>mpfr_mul_2ui</code> and <code>mpfr_div_2ui</code>
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respectively.
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These functions are only kept for compatibility with MPF, one should
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prefer <code>mpfr_mul_2ui</code> and <code>mpfr_div_2ui</code> otherwise.
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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="Custom-Interface.html#Custom-Interface" accesskey="n" rel="next">Custom Interface</a>, Previous: <a href="Exception-Related-Functions.html#Exception-Related-Functions" accesskey="p" rel="prev">Exception Related Functions</a>, Up: <a href="MPFR-Interface.html#MPFR-Interface" accesskey="u" rel="up">MPFR Interface</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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