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<h3 class="section">26.6 Higher-level Interface</h3>
<p>The functions described in the previous sections required the user to
supply pointers to the x and y arrays on each call. The
following functions are equivalent to the corresponding
<code>gsl_interp</code> functions but maintain a copy of this data in the
<code>gsl_spline</code> object. This removes the need to pass both <var>xa</var>
and <var>ya</var> as arguments on each evaluation. These functions are
defined in the header file <samp><span class="file">gsl_spline.h</span></samp>.
<div class="defun">
— Function: gsl_spline * <b>gsl_spline_alloc</b> (<var>const gsl_interp_type * T, size_t size</var>)<var><a name="index-gsl_005fspline_005falloc-2106"></a></var><br>
</div>
<div class="defun">
— Function: int <b>gsl_spline_init</b> (<var>gsl_spline * spline, const double xa</var>[]<var>, const double ya</var>[]<var>, size_t size</var>)<var><a name="index-gsl_005fspline_005finit-2107"></a></var><br>
</div>
<div class="defun">
— Function: void <b>gsl_spline_free</b> (<var>gsl_spline * spline</var>)<var><a name="index-gsl_005fspline_005ffree-2108"></a></var><br>
</div>
<div class="defun">
— Function: const char * <b>gsl_spline_name</b> (<var>const gsl_spline * spline</var>)<var><a name="index-gsl_005fspline_005fname-2109"></a></var><br>
</div>
<div class="defun">
— Function: unsigned int <b>gsl_spline_min_size</b> (<var>const gsl_spline * spline</var>)<var><a name="index-gsl_005fspline_005fmin_005fsize-2110"></a></var><br>
</div>
<div class="defun">
— Function: double <b>gsl_spline_eval</b> (<var>const gsl_spline * spline, double x, gsl_interp_accel * acc</var>)<var><a name="index-gsl_005fspline_005feval-2111"></a></var><br>
— Function: int <b>gsl_spline_eval_e</b> (<var>const gsl_spline * spline, double x, gsl_interp_accel * acc, double * y</var>)<var><a name="index-gsl_005fspline_005feval_005fe-2112"></a></var><br>
</div>
<div class="defun">
— Function: double <b>gsl_spline_eval_deriv</b> (<var>const gsl_spline * spline, double x, gsl_interp_accel * acc</var>)<var><a name="index-gsl_005fspline_005feval_005fderiv-2113"></a></var><br>
— Function: int <b>gsl_spline_eval_deriv_e</b> (<var>const gsl_spline * spline, double x, gsl_interp_accel * acc, double * d</var>)<var><a name="index-gsl_005fspline_005feval_005fderiv_005fe-2114"></a></var><br>
</div>
<div class="defun">
— Function: double <b>gsl_spline_eval_deriv2</b> (<var>const gsl_spline * spline, double x, gsl_interp_accel * acc</var>)<var><a name="index-gsl_005fspline_005feval_005fderiv2-2115"></a></var><br>
— Function: int <b>gsl_spline_eval_deriv2_e</b> (<var>const gsl_spline * spline, double x, gsl_interp_accel * acc, double * d2</var>)<var><a name="index-gsl_005fspline_005feval_005fderiv2_005fe-2116"></a></var><br>
</div>
<div class="defun">
— Function: double <b>gsl_spline_eval_integ</b> (<var>const gsl_spline * spline, double a, double b, gsl_interp_accel * acc</var>)<var><a name="index-gsl_005fspline_005feval_005finteg-2117"></a></var><br>
— Function: int <b>gsl_spline_eval_integ_e</b> (<var>const gsl_spline * spline, double a, double b, gsl_interp_accel * acc, double * result</var>)<var><a name="index-gsl_005fspline_005feval_005finteg_005fe-2118"></a></var><br>
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