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<title>GNU Scientific Library &ndash; Reference Manual: 2D Interpolation Types</title>

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<a name="g_t2D-Interpolation-Types"></a>
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Next: <a href="2D-Evaluation-of-Interpolating-Functions.html#g_t2D-Evaluation-of-Interpolating-Functions" accesskey="n" rel="next">2D Evaluation of Interpolating Functions</a>, Previous: <a href="2D-Interpolation-Grids.html#g_t2D-Interpolation-Grids" accesskey="p" rel="previous">2D Interpolation Grids</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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<hr>
<a name="g_t2D-Interpolation-Types-1"></a>
<h3 class="section">28.12 2D Interpolation Types</h3>
<a name="index-gsl_005finterp2d_005ftype"></a>
<p>The interpolation library provides the following 2D interpolation types:
</p>
<dl>
<dt><a name="index-gsl_005finterp2d_005fbilinear"></a>Interpolation Type: <strong>gsl_interp2d_bilinear</strong></dt>
<dd><a name="index-bilinear-interpolation"></a>
<p>Bilinear interpolation.  This interpolation method does not require any
additional memory.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005fbicubic"></a>Interpolation Type: <strong>gsl_interp2d_bicubic</strong></dt>
<dd><a name="index-bicubic-interpolation"></a>
<p>Bicubic interpolation.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005fname"></a>Function: <em>const char *</em> <strong>gsl_interp2d_name</strong> <em>(const gsl_interp2d * <var>interp</var>)</em></dt>
<dd><p>This function returns the name of the interpolation type used by <var>interp</var>.
For example,
</p>
<div class="example">
<pre class="example">printf (&quot;interp uses '%s' interpolation.\n&quot;, 
        gsl_interp2d_name (interp));
</pre></div>

<p>would print something like,
</p>
<div class="example">
<pre class="example">interp uses 'bilinear' interpolation.
</pre></div>
</dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005fmin_005fsize"></a>Function: <em>unsigned int</em> <strong>gsl_interp2d_min_size</strong> <em>(const gsl_interp2d * <var>interp</var>)</em></dt>
<dt><a name="index-gsl_005finterp2d_005ftype_005fmin_005fsize"></a>Function: <em>unsigned int</em> <strong>gsl_interp2d_type_min_size</strong> <em>(const gsl_interp2d_type * <var>T</var>)</em></dt>
<dd><p>These functions return the minimum number of points required by the
interpolation object <var>interp</var> or interpolation type <var>T</var>.  For
example, bicubic interpolation requires a minimum of 4 points.
</p></dd></dl>




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