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<h4 class="subsection">7.31.5 Restriction Functions</h4>
<p><a name="index-angular-reduction-818"></a><a name="index-reduction-of-angular-variables-819"></a>
<div class="defun">
— Function: double <b>gsl_sf_angle_restrict_symm</b> (<var>double theta</var>)<var><a name="index-gsl_005fsf_005fangle_005frestrict_005fsymm-820"></a></var><br>
— Function: int <b>gsl_sf_angle_restrict_symm_e</b> (<var>double * theta</var>)<var><a name="index-gsl_005fsf_005fangle_005frestrict_005fsymm_005fe-821"></a></var><br>
<blockquote><p>These routines force the angle <var>theta</var> to lie in the range
(-\pi,\pi].
<p>Note that the mathematical value of \pi 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.
<!-- Exceptional Return Values: GSL_ELOSS -->
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_sf_angle_restrict_pos</b> (<var>double theta</var>)<var><a name="index-gsl_005fsf_005fangle_005frestrict_005fpos-822"></a></var><br>
— Function: int <b>gsl_sf_angle_restrict_pos_e</b> (<var>double * theta</var>)<var><a name="index-gsl_005fsf_005fangle_005frestrict_005fpos_005fe-823"></a></var><br>
<blockquote><p>These routines force the angle <var>theta</var> to lie in the range [0,
2\pi).
<p>Note that the mathematical value of 2\pi is slightly greater
than <code>2*M_PI</code>, so the machine number <code>2*M_PI</code> is included in
the range.
<!-- Exceptional Return Values: GSL_ELOSS -->
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