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constants.xml
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constants.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: f9c4a68ef4f89e51e6d9b905ad3ddb6492386dd3 Maintainer: yincheng Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<appendix xml:id="math.constants" xmlns="http://docbook.org/ns/docbook">
&reftitle.constants;
&extension.constants.core;
<para>
<table>
<title>数学常量</title>
<tgroup cols="4">
<thead>
<row>
<entry>常量</entry>
<entry>值</entry>
<entry>说明</entry>
<entry>有效性</entry>
</row>
</thead>
<tbody>
<row xml:id="constant.m-pi">
<entry><constant>M_PI</constant></entry>
<entry>3.14159265358979323846</entry>
<entry>Pi</entry>
<entry></entry>
</row>
<row xml:id="constant.m-e">
<entry><constant>M_E</constant></entry>
<entry>2.7182818284590452354</entry>
<entry>e</entry>
<entry></entry>
</row>
<row xml:id="constant.m-log2e">
<entry><constant>M_LOG2E</constant></entry>
<entry>1.4426950408889634074</entry>
<entry>log_2 e</entry>
<entry></entry>
</row>
<row xml:id="constant.m-log10e">
<entry><constant>M_LOG10E</constant></entry>
<entry>0.43429448190325182765</entry>
<entry>log_10 e</entry>
<entry></entry>
</row>
<row xml:id="constant.m-ln2">
<entry><constant>M_LN2</constant></entry>
<entry>0.69314718055994530942</entry>
<entry>log_e 2</entry>
<entry></entry>
</row>
<row xml:id="constant.m-ln10">
<entry><constant>M_LN10</constant></entry>
<entry>2.30258509299404568402</entry>
<entry>log_e 10</entry>
<entry></entry>
</row>
<row xml:id="constant.m-pi-2">
<entry><constant>M_PI_2</constant></entry>
<entry>1.57079632679489661923</entry>
<entry>pi/2</entry>
<entry></entry>
</row>
<row xml:id="constant.m-pi-4">
<entry><constant>M_PI_4</constant></entry>
<entry>0.78539816339744830962</entry>
<entry>pi/4</entry>
<entry></entry>
</row>
<row xml:id="constant.m-1-pi">
<entry><constant>M_1_PI</constant></entry>
<entry>0.31830988618379067154</entry>
<entry>1/pi</entry>
<entry></entry>
</row>
<row xml:id="constant.m-2-pi">
<entry><constant>M_2_PI</constant></entry>
<entry>0.63661977236758134308</entry>
<entry>2/pi</entry>
<entry></entry>
</row>
<row xml:id="constant.m-sqrtpi">
<entry><constant>M_SQRTPI</constant></entry>
<entry>1.77245385090551602729</entry>
<entry>sqrt(pi)</entry>
<entry></entry>
</row>
<row xml:id="constant.m-2-sqrtpi">
<entry><constant>M_2_SQRTPI</constant></entry>
<entry>1.12837916709551257390</entry>
<entry>2/sqrt(pi)</entry>
<entry></entry>
</row>
<row xml:id="constant.m-sqrt2">
<entry><constant>M_SQRT2</constant></entry>
<entry>1.41421356237309504880</entry>
<entry>sqrt(2)</entry>
<entry></entry>
</row>
<row xml:id="constant.m-sqrt3">
<entry><constant>M_SQRT3</constant></entry>
<entry>1.73205080756887729352</entry>
<entry>sqrt(3)</entry>
<entry></entry>
</row>
<row xml:id="constant.m-sqrt1-2">
<entry><constant>M_SQRT1_2</constant></entry>
<entry>0.70710678118654752440</entry>
<entry>1/sqrt(2)</entry>
<entry></entry>
</row>
<row xml:id="constant.m-lnpi">
<entry><constant>M_LNPI</constant></entry>
<entry>1.14472988584940017414</entry>
<entry>log_e(pi)</entry>
<entry></entry>
</row>
<row xml:id="constant.m-euler">
<entry><constant>M_EULER</constant></entry>
<entry>0.57721566490153286061</entry>
<entry>欧拉常数</entry>
<entry></entry>
</row>
<row xml:id="constant.php-round-half-up">
<entry><constant>PHP_ROUND_HALF_UP</constant></entry>
<entry>1</entry>
<entry>一半的数值时向上取整</entry>
<entry></entry>
</row>
<row xml:id="constant.php-round-half-down">
<entry><constant>PHP_ROUND_HALF_DOWN</constant></entry>
<entry>2</entry>
<entry>一半的数值时向下取整</entry>
<entry></entry>
</row>
<row xml:id="constant.php-round-half-even">
<entry><constant>PHP_ROUND_HALF_EVEN</constant></entry>
<entry>3</entry>
<entry>四舍五入为偶数</entry>
<entry></entry>
</row>
<row xml:id="constant.php-round-half-odd">
<entry><constant>PHP_ROUND_HALF_ODD</constant></entry>
<entry>4</entry>
<entry>四舍五入为奇数</entry>
<entry></entry>
</row>
<row xml:id="constant.nan">
<entry><constant>NAN</constant></entry>
<entry>NAN(作为浮点数)</entry>
<entry>非数值</entry>
<entry></entry>
</row>
<row xml:id="constant.inf">
<entry><constant>INF</constant></entry>
<entry>INF(作为浮点数)</entry>
<entry>无穷大</entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</appendix>
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