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<a name="Evaluation-of-Interpolating-Functions"></a>
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Next: <a href="Higher_002dlevel-Interface.html#Higher_002dlevel-Interface" accesskey="n" rel="next">Higher-level Interface</a>, Previous: <a href="Index-Look_002dup-and-Acceleration.html#Index-Look_002dup-and-Acceleration" accesskey="p" rel="previous">Index Look-up and Acceleration</a>, Up: <a href="Interpolation.html#Interpolation" accesskey="u" rel="up">Interpolation</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Evaluation-of-Interpolating-Functions-1"></a>
<h3 class="section">27.5 Evaluation of Interpolating Functions</h3>
<dl>
<dt><a name="index-gsl_005finterp_005feval"></a>Function: <em>double</em> <strong>gsl_interp_eval</strong> <em>(const gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], double <var>x</var>, gsl_interp_accel * <var>acc</var>)</em></dt>
<dt><a name="index-gsl_005finterp_005feval_005fe"></a>Function: <em>int</em> <strong>gsl_interp_eval_e</strong> <em>(const gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], double <var>x</var>, gsl_interp_accel * <var>acc</var>, double * <var>y</var>)</em></dt>
<dd><p>These functions return the interpolated value of <var>y</var> for a given
point <var>x</var>, using the interpolation object <var>interp</var>, data
arrays <var>xa</var> and <var>ya</var> and the accelerator <var>acc</var>. When
<var>x</var> is outside the range of <var>xa</var>, the error code
<code>GSL_EDOM</code> is returned with a value of <code>GSL_NAN</code> for
<var>y</var>.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005finterp_005feval_005fderiv"></a>Function: <em>double</em> <strong>gsl_interp_eval_deriv</strong> <em>(const gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], double <var>x</var>, gsl_interp_accel * <var>acc</var>)</em></dt>
<dt><a name="index-gsl_005finterp_005feval_005fderiv_005fe"></a>Function: <em>int</em> <strong>gsl_interp_eval_deriv_e</strong> <em>(const gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], double <var>x</var>, gsl_interp_accel * <var>acc</var>, double * <var>d</var>)</em></dt>
<dd><p>These functions return the derivative <var>d</var> of an interpolated
function for a given point <var>x</var>, using the interpolation object
<var>interp</var>, data arrays <var>xa</var> and <var>ya</var> and the accelerator
<var>acc</var>.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005finterp_005feval_005fderiv2"></a>Function: <em>double</em> <strong>gsl_interp_eval_deriv2</strong> <em>(const gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], double <var>x</var>, gsl_interp_accel * <var>acc</var>)</em></dt>
<dt><a name="index-gsl_005finterp_005feval_005fderiv2_005fe"></a>Function: <em>int</em> <strong>gsl_interp_eval_deriv2_e</strong> <em>(const gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], double <var>x</var>, gsl_interp_accel * <var>acc</var>, double * <var>d2</var>)</em></dt>
<dd><p>These functions return the second derivative <var>d2</var> of an interpolated
function for a given point <var>x</var>, using the interpolation object
<var>interp</var>, data arrays <var>xa</var> and <var>ya</var> and the accelerator
<var>acc</var>.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005finterp_005feval_005finteg"></a>Function: <em>double</em> <strong>gsl_interp_eval_integ</strong> <em>(const gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], double <var>a</var>, double <var>b</var>, gsl_interp_accel * <var>acc</var>)</em></dt>
<dt><a name="index-gsl_005finterp_005feval_005finteg_005fe"></a>Function: <em>int</em> <strong>gsl_interp_eval_integ_e</strong> <em>(const gsl_interp * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], double <var>a</var>, double <var>b</var>, gsl_interp_accel * <var>acc</var>, double * <var>result</var>)</em></dt>
<dd><p>These functions return the numerical integral <var>result</var> of an
interpolated function over the range [<var>a</var>, <var>b</var>], using the
interpolation object <var>interp</var>, data arrays <var>xa</var> and <var>ya</var> and
the accelerator <var>acc</var>.
</p></dd></dl>
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