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<title>GNU Scientific Library &ndash; Reference Manual: 1D Interpolation Functions</title>

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<a name="g_t1D-Interpolation-Functions"></a>
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<p>
Next: <a href="1D-Interpolation-Types.html#g_t1D-Interpolation-Types" accesskey="n" rel="next">1D Interpolation Types</a>, Previous: <a href="1D-Introduction-to-Interpolation.html#g_t1D-Introduction-to-Interpolation" accesskey="p" rel="previous">1D Introduction to Interpolation</a>, Up: <a href="Interpolation.html#Interpolation" accesskey="u" rel="up">Interpolation</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="g_t1D-Interpolation-Functions-1"></a>
<h3 class="section">28.2 1D 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.
</p>
<dl>
<dt><a name="index-gsl_005finterp_005falloc"></a>Function: <em>gsl_interp *</em> <strong>gsl_interp_alloc</strong> <em>(const gsl_interp_type * <var>T</var>, size_t <var>size</var>)</em></dt>
<dd><a name="index-gsl_005finterp"></a>
<p>This function returns a pointer to a newly allocated interpolation
object of type <var>T</var> for <var>size</var> data-points.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp_005finit"></a>Function: <em>int</em> <strong>gsl_interp_init</strong> <em>(gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], size_t <var>size</var>)</em></dt>
<dd><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 <em>x</em> values; 
the behavior for other arrangements is not defined.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp_005ffree"></a>Function: <em>void</em> <strong>gsl_interp_free</strong> <em>(gsl_interp * <var>interp</var>)</em></dt>
<dd><p>This function frees the interpolation object <var>interp</var>.
</p></dd></dl>




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