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<title>GNU Scientific Library &ndash; Reference Manual: Restriction Functions</title>

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Next: <a href="Trigonometric-Functions-With-Error-Estimates.html#Trigonometric-Functions-With-Error-Estimates" accesskey="n" rel="next">Trigonometric Functions With Error Estimates</a>, Previous: <a href="Conversion-Functions.html#Conversion-Functions" accesskey="p" rel="previous">Conversion Functions</a>, Up: <a href="Trigonometric-Functions.html#Trigonometric-Functions" accesskey="u" rel="up">Trigonometric Functions</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Restriction-Functions-1"></a>
<h4 class="subsection">7.31.5 Restriction Functions</h4>
<a name="index-angular-reduction"></a>
<a name="index-reduction-of-angular-variables"></a>

<dl>
<dt><a name="index-gsl_005fsf_005fangle_005frestrict_005fsymm"></a>Function: <em>double</em> <strong>gsl_sf_angle_restrict_symm</strong> <em>(double <var>theta</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fangle_005frestrict_005fsymm_005fe"></a>Function: <em>int</em> <strong>gsl_sf_angle_restrict_symm_e</strong> <em>(double * <var>theta</var>)</em></dt>
<dd><p>These routines force the angle <var>theta</var> to lie in the range
<em>(-\pi,\pi]</em>.  
</p>
<p>Note that the mathematical value of <em>\pi</em> is slightly greater
than <code>M_PI</code>, so the machine numbers <code>M_PI</code> and <code>-M_PI</code>
are included in the range.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fsf_005fangle_005frestrict_005fpos"></a>Function: <em>double</em> <strong>gsl_sf_angle_restrict_pos</strong> <em>(double <var>theta</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fangle_005frestrict_005fpos_005fe"></a>Function: <em>int</em> <strong>gsl_sf_angle_restrict_pos_e</strong> <em>(double * <var>theta</var>)</em></dt>
<dd><p>These routines force the angle <var>theta</var> to lie in the range <em>[0,
2\pi)</em>. 
</p>
<p>Note that the mathematical value of <em>2\pi</em> is slightly greater
than <code>2*M_PI</code>, so the machine number <code>2*M_PI</code> is included in
the range.
</p>
</dd></dl>





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