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203 lines
13 KiB
HTML
203 lines
13 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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Math (LIBM)</title>
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<meta name="description" content="Math (LIBM)">
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<meta name="keywords" content="Math (LIBM)">
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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="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="version.html#version" rel="next" title="version">
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<link href="index.html#Top" rel="prev" title="Top">
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</head>
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<body lang="en">
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<a name="Math"></a>
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<div class="header">
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<p>
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Next: <a href="Complex.html#Complex" accesskey="n" rel="next">Complex</a>, Previous: <a href="index.html#Top" accesskey="p" rel="prev">Top</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Mathematical-Functions-_0028math_002eh_0029"></a>
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<h2 class="chapter">1 Mathematical Functions (<samp>math.h</samp>)</h2>
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<p>This chapter groups a wide variety of mathematical functions. The
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corresponding definitions and declarations are in <samp>math.h</samp>.
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The definition of HUGE_VAL from <samp>math.h</samp> is of particular interest.
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</p>
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<ol>
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<li> The representation of infinity as a <code>double</code> is defined as
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<code>HUGE_VAL</code>; this number is returned on overflow by many functions.
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The macro <code>HUGE_VALF</code> is a corresponding value for <code>float</code>.
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</li></ol>
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<p>Alternative declarations of the mathematical functions, which exploit
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specific machine capabilities to operate faster—but generally have
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less error checking and may reflect additional limitations on some
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machines—are available when you include <samp>fastmath.h</samp> instead of
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<samp>math.h</samp>.
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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="version.html#version" accesskey="1">version</a>:</td><td> </td><td align="left" valign="top">Version of library
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</td></tr>
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<tr><td align="left" valign="top">• <a href="acos.html#acos" accesskey="2">acos</a>:</td><td> </td><td align="left" valign="top">Arccosine
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</td></tr>
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<tr><td align="left" valign="top">• <a href="acosh.html#acosh" accesskey="3">acosh</a>:</td><td> </td><td align="left" valign="top">Inverse hyperbolic cosine
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</td></tr>
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<tr><td align="left" valign="top">• <a href="asin.html#asin" accesskey="4">asin</a>:</td><td> </td><td align="left" valign="top">Arcsine
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</td></tr>
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<tr><td align="left" valign="top">• <a href="asinh.html#asinh" accesskey="5">asinh</a>:</td><td> </td><td align="left" valign="top">Inverse hyperbolic sine
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</td></tr>
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<tr><td align="left" valign="top">• <a href="atan.html#atan" accesskey="6">atan</a>:</td><td> </td><td align="left" valign="top">Arctangent
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</td></tr>
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<tr><td align="left" valign="top">• <a href="atan2.html#atan2" accesskey="7">atan2</a>:</td><td> </td><td align="left" valign="top">Arctangent of y/x
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</td></tr>
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<tr><td align="left" valign="top">• <a href="atanh.html#atanh" accesskey="8">atanh</a>:</td><td> </td><td align="left" valign="top">Inverse hyperbolic tangent
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</td></tr>
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<tr><td align="left" valign="top">• <a href="jN.html#jN" accesskey="9">jN</a>:</td><td> </td><td align="left" valign="top">Bessel functions (jN, yN)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="cbrt.html#cbrt">cbrt</a>:</td><td> </td><td align="left" valign="top">Cube root
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</td></tr>
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<tr><td align="left" valign="top">• <a href="copysign.html#copysign">copysign</a>:</td><td> </td><td align="left" valign="top">Sign of Y, magnitude of X
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</td></tr>
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<tr><td align="left" valign="top">• <a href="cosh.html#cosh">cosh</a>:</td><td> </td><td align="left" valign="top">Hyperbolic cosine
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</td></tr>
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<tr><td align="left" valign="top">• <a href="erf.html#erf">erf</a>:</td><td> </td><td align="left" valign="top">Error function (erf, erfc)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="exp.html#exp">exp</a>:</td><td> </td><td align="left" valign="top">Exponential, base e
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</td></tr>
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<tr><td align="left" valign="top">• <a href="exp10.html#exp10">exp10</a>:</td><td> </td><td align="left" valign="top">Exponential, base 10
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</td></tr>
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<tr><td align="left" valign="top">• <a href="exp2.html#exp2">exp2</a>:</td><td> </td><td align="left" valign="top">Exponential, base 2
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</td></tr>
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<tr><td align="left" valign="top">• <a href="expm1.html#expm1">expm1</a>:</td><td> </td><td align="left" valign="top">Exponential, base e, of x - 1
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</td></tr>
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<tr><td align="left" valign="top">• <a href="fabs.html#fabs">fabs</a>:</td><td> </td><td align="left" valign="top">Absolute value (magnitude)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="fdim.html#fdim">fdim</a>:</td><td> </td><td align="left" valign="top">Positive difference
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</td></tr>
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<tr><td align="left" valign="top">• <a href="floor.html#floor">floor</a>:</td><td> </td><td align="left" valign="top">Floor and ceiling (floor, ceil)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="fma.html#fma">fma</a>:</td><td> </td><td align="left" valign="top">Floating multiply add
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</td></tr>
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<tr><td align="left" valign="top">• <a href="fmax.html#fmax">fmax</a>:</td><td> </td><td align="left" valign="top">Maximum
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</td></tr>
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<tr><td align="left" valign="top">• <a href="fmin.html#fmin">fmin</a>:</td><td> </td><td align="left" valign="top">Minimum
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</td></tr>
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<tr><td align="left" valign="top">• <a href="fmod.html#fmod">fmod</a>:</td><td> </td><td align="left" valign="top">Floating-point remainder (modulo)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="fpclassify.html#fpclassify">fpclassify</a>:</td><td> </td><td align="left" valign="top">Floating-point classification macro
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</td></tr>
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<tr><td align="left" valign="top">• <a href="frexp.html#frexp">frexp</a>:</td><td> </td><td align="left" valign="top">Split floating-point number
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</td></tr>
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<tr><td align="left" valign="top">• <a href="gamma.html#gamma">gamma</a>:</td><td> </td><td align="left" valign="top">Logarithmic gamma function
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</td></tr>
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<tr><td align="left" valign="top">• <a href="hypot.html#hypot">hypot</a>:</td><td> </td><td align="left" valign="top">Distance from origin
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ilogb.html#ilogb">ilogb</a>:</td><td> </td><td align="left" valign="top">Get exponent
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</td></tr>
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<tr><td align="left" valign="top">• <a href="infinity.html#infinity">infinity</a>:</td><td> </td><td align="left" valign="top">Floating infinity
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</td></tr>
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<tr><td align="left" valign="top">• <a href="isgreater.html#isgreater">isgreater</a>:</td><td> </td><td align="left" valign="top">Comparison macros
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ldexp.html#ldexp">ldexp</a>:</td><td> </td><td align="left" valign="top">Scale by a power of 2
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</td></tr>
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<tr><td align="left" valign="top">• <a href="log.html#log">log</a>:</td><td> </td><td align="left" valign="top">Natural logarithms
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</td></tr>
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<tr><td align="left" valign="top">• <a href="log10.html#log10">log10</a>:</td><td> </td><td align="left" valign="top">Base 10 logarithms
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</td></tr>
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<tr><td align="left" valign="top">• <a href="log1p.html#log1p">log1p</a>:</td><td> </td><td align="left" valign="top">Log of 1 + X
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</td></tr>
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<tr><td align="left" valign="top">• <a href="log2.html#log2">log2</a>:</td><td> </td><td align="left" valign="top">Base 2 logarithms
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</td></tr>
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<tr><td align="left" valign="top">• <a href="logb.html#logb">logb</a>:</td><td> </td><td align="left" valign="top">Get exponent
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</td></tr>
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<tr><td align="left" valign="top">• <a href="lrint.html#lrint">lrint</a>:</td><td> </td><td align="left" valign="top">Round to integer
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</td></tr>
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<tr><td align="left" valign="top">• <a href="lround.html#lround">lround</a>:</td><td> </td><td align="left" valign="top">Round to integer, away from zero (lround, llround)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="modf.html#modf">modf</a>:</td><td> </td><td align="left" valign="top">Split fractional and integer parts
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</td></tr>
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<tr><td align="left" valign="top">• <a href="nan.html#nan">nan</a>:</td><td> </td><td align="left" valign="top">Floating Not a Number
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</td></tr>
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<tr><td align="left" valign="top">• <a href="nearbyint.html#nearbyint">nearbyint</a>:</td><td> </td><td align="left" valign="top">Round to integer
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</td></tr>
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<tr><td align="left" valign="top">• <a href="nextafter.html#nextafter">nextafter</a>:</td><td> </td><td align="left" valign="top">Get next representable number
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</td></tr>
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<tr><td align="left" valign="top">• <a href="pow.html#pow">pow</a>:</td><td> </td><td align="left" valign="top">X to the power Y
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</td></tr>
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<tr><td align="left" valign="top">• <a href="pow10.html#pow10">pow10</a>:</td><td> </td><td align="left" valign="top">10 to the power X
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</td></tr>
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<tr><td align="left" valign="top">• <a href="remainder.html#remainder">remainder</a>:</td><td> </td><td align="left" valign="top">remainder of X divided by Y
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</td></tr>
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<tr><td align="left" valign="top">• <a href="remquo.html#remquo">remquo</a>:</td><td> </td><td align="left" valign="top">Remainder and part of quotient
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</td></tr>
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<tr><td align="left" valign="top">• <a href="rint.html#rint">rint</a>:</td><td> </td><td align="left" valign="top">Round to integer
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</td></tr>
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<tr><td align="left" valign="top">• <a href="round.html#round">round</a>:</td><td> </td><td align="left" valign="top">Round to integer, away from zero
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</td></tr>
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<tr><td align="left" valign="top">• <a href="scalbn.html#scalbn">scalbn</a>:</td><td> </td><td align="left" valign="top">Scale by a power of FLT_RADIX (2)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="signbit.html#signbit">signbit</a>:</td><td> </td><td align="left" valign="top">Does floating-point number have negative sign?
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</td></tr>
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<tr><td align="left" valign="top">• <a href="sin.html#sin">sin</a>:</td><td> </td><td align="left" valign="top">Sine or cosine (sin, cos)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="sinh.html#sinh">sinh</a>:</td><td> </td><td align="left" valign="top">Hyperbolic sine
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</td></tr>
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<tr><td align="left" valign="top">• <a href="sqrt.html#sqrt">sqrt</a>:</td><td> </td><td align="left" valign="top">Positive square root
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</td></tr>
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<tr><td align="left" valign="top">• <a href="tan.html#tan">tan</a>:</td><td> </td><td align="left" valign="top">Tangent
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</td></tr>
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<tr><td align="left" valign="top">• <a href="tanh.html#tanh">tanh</a>:</td><td> </td><td align="left" valign="top">Hyperbolic tangent
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</td></tr>
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<tr><td align="left" valign="top">• <a href="trunc.html#trunc">trunc</a>:</td><td> </td><td align="left" valign="top">Round to integer, towards zero
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</td></tr>
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</table>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Complex.html#Complex" accesskey="n" rel="next">Complex</a>, Previous: <a href="index.html#Top" accesskey="p" rel="prev">Top</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-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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