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  • Committer: Bazaar Package Importer
  • Author(s): Gustavo Noronha Silva
  • Date: 2009-02-15 13:00:43 UTC
  • mfrom: (1.3.1 upstream) (69.1.10 intrepid)
  • Revision ID: james.westby@ubuntu.com-20090215130043-q47fbt3owmt42m2f
Tags: 2.18.4-2
* Release to unstable
* debian/rules:
- bump SHVER, since we are already forcing a 2.18.0 dependecy on the
  symbols introduced in the development versions
* debian/control.in:
- added Homepage and Vcs-* control fields

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<a name="glib-Numerical-Definitions"></a><div class="titlepage"></div>
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<td valign="top">
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<h2>
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<a name="id2899930"></a><span class="refentrytitle">Numerical Definitions</span>
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</h2>
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<p>Numerical Definitions &#8212; mathematical constants, and floating point decomposition</p>
 
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<h2><span class="refentrytitle"><a name="glib-Numerical-Definitions.top_of_page"></a>Numerical Definitions</span></h2>
 
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<p>Numerical Definitions — mathematical constants, and floating point decomposition</p>
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</td>
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<td valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsynopsisdiv">
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<h2>Synopsis</h2>
 
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<a name="glib-Numerical-Definitions.synopsis"></a><h2>Synopsis</h2>
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<pre class="synopsis">
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#include &lt;glib.h&gt;
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-IEEE754-FLOAT-BIAS:CAPS">G_IEEE754_FLOAT_BIAS</a>
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-IEEE754-DOUBLE-BIAS:CAPS">G_IEEE754_DOUBLE_BIAS</a>
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union               <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754">GFloatIEEE754</a>;
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union               <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754">GDoubleIEEE754</a>;
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-E:CAPS">G_E</a>
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-LN2:CAPS">G_LN2</a>
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-LN10:CAPS">G_LN10</a>
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-PI:CAPS">G_PI</a>
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-PI-2:CAPS">G_PI_2</a>
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-PI-4:CAPS">G_PI_4</a>
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-SQRT2:CAPS">G_SQRT2</a>
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-LOG-2-BASE-10:CAPS">G_LOG_2_BASE_10</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-IEEE754-FLOAT-BIAS--CAPS" title="G_IEEE754_FLOAT_BIAS">G_IEEE754_FLOAT_BIAS</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-IEEE754-DOUBLE-BIAS--CAPS" title="G_IEEE754_DOUBLE_BIAS">G_IEEE754_DOUBLE_BIAS</a>
 
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union               <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754" title="union GFloatIEEE754">GFloatIEEE754</a>;
 
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union               <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754" title="union GDoubleIEEE754">GDoubleIEEE754</a>;
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-E--CAPS" title="G_E">G_E</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-LN2--CAPS" title="G_LN2">G_LN2</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-LN10--CAPS" title="G_LN10">G_LN10</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-PI--CAPS" title="G_PI">G_PI</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-PI-2--CAPS" title="G_PI_2">G_PI_2</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-PI-4--CAPS" title="G_PI_4">G_PI_4</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-SQRT2--CAPS" title="G_SQRT2">G_SQRT2</a>
 
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#define             <a class="link" href="glib-Numerical-Definitions.html#G-LOG-2-BASE-10--CAPS" title="G_LOG_2_BASE_10">G_LOG_2_BASE_10</a>
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</pre>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2900046"></a><h2>Description</h2>
 
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<a name="glib-Numerical-Definitions.description"></a><h2>Description</h2>
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<p>
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GLib offers mathematical constants such as <a class="link" href="glib-Numerical-Definitions.html#G-PI:CAPS"><span class="type">G_PI</span></a> for the value of pi;
 
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GLib offers mathematical constants such as <a class="link" href="glib-Numerical-Definitions.html#G-PI--CAPS" title="G_PI"><span class="type">G_PI</span></a> for the value of pi;
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many platforms have these in the C library, but some don't, the GLib
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versions always exist.
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</p>
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<p>
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The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the
 
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The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754" title="union GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754" title="union GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the
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        sign, mantissa and exponent of IEEE floats and doubles. These
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        unions are defined as appropriate for a given platform. 
 
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        unions are defined as appropriate for a given platform.
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 IEEE floats and doubles are supported (used for
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        storage) by at least Intel, PPC and Sparc, for reference: <a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2900104"></a><h2>Details</h2>
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<div class="refsect2" lang="en">
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<a name="id2900114"></a><h3>
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<a name="G-IEEE754-FLOAT-BIAS:CAPS"></a>G_IEEE754_FLOAT_BIAS</h3>
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<a class="indexterm" name="id2900127"></a><pre class="programlisting">#define G_IEEE754_FLOAT_BIAS      (127)
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</pre>
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<p>
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See <a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
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</p>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900151"></a><h3>
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<a name="G-IEEE754-DOUBLE-BIAS:CAPS"></a>G_IEEE754_DOUBLE_BIAS</h3>
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<a class="indexterm" name="id2900164"></a><pre class="programlisting">#define G_IEEE754_DOUBLE_BIAS     (1023)
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</pre>
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<p>
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See <a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
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</p>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900188"></a><h3>
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<a name="GFloatIEEE754"></a>union GFloatIEEE754</h3>
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<a class="indexterm" name="id2900200"></a><pre class="programlisting">union GFloatIEEE754
 
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<a name="glib-Numerical-Definitions.details"></a><h2>Details</h2>
 
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<div class="refsect2" lang="en">
 
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<a name="G-IEEE754-FLOAT-BIAS--CAPS"></a><h3>G_IEEE754_FLOAT_BIAS</h3>
 
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<pre class="programlisting">#define G_IEEE754_FLOAT_BIAS        (127)
 
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</pre>
 
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<p>
 
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See <a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
 
100
</p>
 
101
</div>
 
102
<hr>
 
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<div class="refsect2" lang="en">
 
104
<a name="G-IEEE754-DOUBLE-BIAS--CAPS"></a><h3>G_IEEE754_DOUBLE_BIAS</h3>
 
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<pre class="programlisting">#define G_IEEE754_DOUBLE_BIAS       (1023)
 
106
</pre>
 
107
<p>
 
108
See <a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
 
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</p>
 
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</div>
 
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<hr>
 
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<div class="refsect2" lang="en">
 
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<a name="GFloatIEEE754"></a><h3>union GFloatIEEE754</h3>
 
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<pre class="programlisting">union GFloatIEEE754
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{
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  gfloat v_float;
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  struct {
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};
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</pre>
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<p>
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The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the
 
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The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754" title="union GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754" title="union GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the
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        sign, mantissa and exponent of IEEE floats and doubles. These
130
 
        unions are defined as appropriate for a given platform. 
 
127
        unions are defined as appropriate for a given platform.
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 IEEE floats and doubles are supported (used for
132
 
        storage) by at least Intel, PPC and Sparc, for reference: 
 
129
        storage) by at least Intel, PPC and Sparc, for reference:
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130
<a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
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</p>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900247"></a><h3>
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<a name="GDoubleIEEE754"></a>union GDoubleIEEE754</h3>
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<a class="indexterm" name="id2900260"></a><pre class="programlisting">union GDoubleIEEE754
 
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<a name="GDoubleIEEE754"></a><h3>union GDoubleIEEE754</h3>
 
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<pre class="programlisting">union GDoubleIEEE754
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{
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  gdouble v_double;
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  struct {
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};
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</pre>
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<p>
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The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the
 
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The <a class="link" href="glib-Numerical-Definitions.html#GFloatIEEE754" title="union GFloatIEEE754"><span class="type">GFloatIEEE754</span></a> and <a class="link" href="glib-Numerical-Definitions.html#GDoubleIEEE754" title="union GDoubleIEEE754"><span class="type">GDoubleIEEE754</span></a> unions are used to access the
153
149
        sign, mantissa and exponent of IEEE floats and doubles. These
154
 
        unions are defined as appropriate for a given platform. 
 
150
        unions are defined as appropriate for a given platform.
155
151
 IEEE floats and doubles are supported (used for
156
 
        storage) by at least Intel, PPC and Sparc, for reference: 
 
152
        storage) by at least Intel, PPC and Sparc, for reference:
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<a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
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</p>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900307"></a><h3>
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<a name="G-E:CAPS"></a>G_E</h3>
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<a class="indexterm" name="id2900319"></a><pre class="programlisting">#define G_E     2.7182818284590452353602874713526624977572470937000
 
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<a name="G-E--CAPS"></a><h3>G_E</h3>
 
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<pre class="programlisting">#define G_E     2.7182818284590452353602874713526624977572470937000
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</pre>
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<p>
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The base of natural logarithms.
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900335"></a><h3>
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<a name="G-LN2:CAPS"></a>G_LN2</h3>
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<a class="indexterm" name="id2900347"></a><pre class="programlisting">#define G_LN2   0.69314718055994530941723212145817656807550013436026
 
167
<a name="G-LN2--CAPS"></a><h3>G_LN2</h3>
 
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<pre class="programlisting">#define G_LN2   0.69314718055994530941723212145817656807550013436026
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</pre>
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<p>
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The natural logarithm of 2.
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900363"></a><h3>
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<a name="G-LN10:CAPS"></a>G_LN10</h3>
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<a class="indexterm" name="id2900376"></a><pre class="programlisting">#define G_LN10  2.3025850929940456840179914546843642076011014886288
 
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<a name="G-LN10--CAPS"></a><h3>G_LN10</h3>
 
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<pre class="programlisting">#define G_LN10  2.3025850929940456840179914546843642076011014886288
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</pre>
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<p>
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The natural logarithm of 10.
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900392"></a><h3>
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<a name="G-PI:CAPS"></a>G_PI</h3>
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<a class="indexterm" name="id2900405"></a><pre class="programlisting">#define G_PI    3.1415926535897932384626433832795028841971693993751
 
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<a name="G-PI--CAPS"></a><h3>G_PI</h3>
 
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<pre class="programlisting">#define G_PI    3.1415926535897932384626433832795028841971693993751
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</pre>
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<p>
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The value of pi (ratio of circle's circumference to its diameter).
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900422"></a><h3>
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<a name="G-PI-2:CAPS"></a>G_PI_2</h3>
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<a class="indexterm" name="id2900435"></a><pre class="programlisting">#define G_PI_2  1.5707963267948966192313216916397514420985846996876
 
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<a name="G-PI-2--CAPS"></a><h3>G_PI_2</h3>
 
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<pre class="programlisting">#define G_PI_2  1.5707963267948966192313216916397514420985846996876
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</pre>
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<p>
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Pi divided by 2.
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900451"></a><h3>
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<a name="G-PI-4:CAPS"></a>G_PI_4</h3>
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<a class="indexterm" name="id2900463"></a><pre class="programlisting">#define G_PI_4  0.78539816339744830961566084581987572104929234984378
 
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<a name="G-PI-4--CAPS"></a><h3>G_PI_4</h3>
 
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<pre class="programlisting">#define G_PI_4  0.78539816339744830961566084581987572104929234984378
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</pre>
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<p>
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Pi divided by 4.
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900479"></a><h3>
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<a name="G-SQRT2:CAPS"></a>G_SQRT2</h3>
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<a class="indexterm" name="id2900492"></a><pre class="programlisting">#define G_SQRT2 1.4142135623730950488016887242096980785696718753769
 
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<a name="G-SQRT2--CAPS"></a><h3>G_SQRT2</h3>
 
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<pre class="programlisting">#define G_SQRT2 1.4142135623730950488016887242096980785696718753769
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</pre>
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<p>
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The square root of two.
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<hr>
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<div class="refsect2" lang="en">
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<a name="id2900508"></a><h3>
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<a name="G-LOG-2-BASE-10:CAPS"></a>G_LOG_2_BASE_10</h3>
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<a class="indexterm" name="id2900522"></a><pre class="programlisting">#define G_LOG_2_BASE_10           (0.30102999566398119521)
 
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<a name="G-LOG-2-BASE-10--CAPS"></a><h3>G_LOG_2_BASE_10</h3>
 
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<pre class="programlisting">#define G_LOG_2_BASE_10             (0.30102999566398119521)
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</pre>
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<p>
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Used for fooling around with float formats, see 
 
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Used for fooling around with float formats, see
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<a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
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</p>
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<div class="refsect1" lang="en">
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<a name="id2900547"></a><h2>See Also</h2>
 
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<a name="glib-Numerical-Definitions.see-also"></a><h2>See Also</h2>
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<p>
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<a class="ulink" href="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html" target="_top">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</a>
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2900565"></a><div class="refsect2" lang="en"><a name="id2900566"></a></div>
 
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</div>
 
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<div class="footer">
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<div class="refsect2" lang="en"><a name="id2900568"></a></div>
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