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<h3 class="section">26.2 Interpolation Functions</h3>
<p>The interpolation function for a given dataset is stored in a
<code>gsl_interp</code> object. These are created by the following functions.
<div class="defun">
— Function: gsl_interp * <b>gsl_interp_alloc</b> (<var>const gsl_interp_type * T, size_t size</var>)<var><a name="index-gsl_005finterp_005falloc-2079"></a></var><br>
<blockquote><p>This function returns a pointer to a newly allocated interpolation
object of type <var>T</var> for <var>size</var> data-points.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_interp_init</b> (<var>gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, size_t size</var>)<var><a name="index-gsl_005finterp_005finit-2080"></a></var><br>
<blockquote><p>This function initializes the interpolation object <var>interp</var> for the
data (<var>xa</var>,<var>ya</var>) where <var>xa</var> and <var>ya</var> are arrays of size
<var>size</var>. The interpolation object (<code>gsl_interp</code>) does not save
the data arrays <var>xa</var> and <var>ya</var> and only stores the static state
computed from the data. The <var>xa</var> data array is always assumed to be
strictly ordered, with increasing x values;
the behavior for other arrangements is not defined.
</p></blockquote></div>
<div class="defun">
— Function: void <b>gsl_interp_free</b> (<var>gsl_interp * interp</var>)<var><a name="index-gsl_005finterp_005ffree-2081"></a></var><br>
<blockquote><p>This function frees the interpolation object <var>interp</var>.
</p></blockquote></div>
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