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126 lines
3.6 KiB
Plaintext
126 lines
3.6 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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Numerical Definitions
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<!-- ##### SECTION Short_Description ##### -->
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mathematical constants, and floating point decomposition
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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GLib offers mathematical constants such as #G_PI 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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</para>
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<para>
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The #GFloatIEEE754 and #GDoubleIEEE754 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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IEEE floats and doubles are supported (used for
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storage) by at least Intel, PPC and Sparc, for reference: <ulink url="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</ulink>
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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<ulink url="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</ulink>
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</para>
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<!-- ##### SECTION Stability_Level ##### -->
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<!-- ##### SECTION Image ##### -->
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<!-- ##### MACRO G_IEEE754_FLOAT_BIAS ##### -->
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<para>
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See <ulink url="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</ulink>
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</para>
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<!-- ##### MACRO G_IEEE754_DOUBLE_BIAS ##### -->
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<para>
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See <ulink url="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</ulink>
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</para>
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<!-- ##### UNION GFloatIEEE754 ##### -->
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<para>
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The #GFloatIEEE754 and #GDoubleIEEE754 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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IEEE floats and doubles are supported (used for
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storage) by at least Intel, PPC and Sparc, for reference:
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<ulink url="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</ulink>
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</para>
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<!-- ##### UNION GDoubleIEEE754 ##### -->
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<para>
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The #GFloatIEEE754 and #GDoubleIEEE754 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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IEEE floats and doubles are supported (used for
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storage) by at least Intel, PPC and Sparc, for reference:
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<ulink url="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</ulink>
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</para>
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<!-- ##### MACRO G_E ##### -->
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<para>
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The base of natural logarithms.
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</para>
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<!-- ##### MACRO G_LN2 ##### -->
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<para>
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The natural logarithm of 2.
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</para>
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<!-- ##### MACRO G_LN10 ##### -->
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<para>
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The natural logarithm of 10.
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</para>
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<!-- ##### MACRO G_PI ##### -->
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<para>
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The value of pi (ratio of circle's circumference to its diameter).
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</para>
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<!-- ##### MACRO G_PI_2 ##### -->
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<para>
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Pi divided by 2.
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</para>
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<!-- ##### MACRO G_PI_4 ##### -->
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<para>
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Pi divided by 4.
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</para>
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<!-- ##### MACRO G_SQRT2 ##### -->
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<para>
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The square root of two.
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</para>
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<!-- ##### MACRO G_LOG_2_BASE_10 ##### -->
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<para>
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Used for fooling around with float formats, see
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<ulink url="http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html">http://cch.loria.fr/documentation/IEEE754/numerical_comp_guide/ncg_math.doc.html</ulink>
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</para>
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