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<title>Evaluation of Interpolating Functions - GNU Scientific Library -- Reference Manual</title>
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<h3 class="section">26.5 Evaluation of Interpolating Functions</h3>
<div class="defun">
— Function: double <b>gsl_interp_eval</b> (<var>const gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, double x, gsl_interp_accel * acc</var>)<var><a name="index-gsl_005finterp_005feval-2098"></a></var><br>
— Function: int <b>gsl_interp_eval_e</b> (<var>const gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, double x, gsl_interp_accel * acc, double * y</var>)<var><a name="index-gsl_005finterp_005feval_005fe-2099"></a></var><br>
<blockquote><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>.
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_interp_eval_deriv</b> (<var>const gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, double x, gsl_interp_accel * acc</var>)<var><a name="index-gsl_005finterp_005feval_005fderiv-2100"></a></var><br>
— Function: int <b>gsl_interp_eval_deriv_e</b> (<var>const gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, double x, gsl_interp_accel * acc, double * d</var>)<var><a name="index-gsl_005finterp_005feval_005fderiv_005fe-2101"></a></var><br>
<blockquote><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></blockquote></div>
<div class="defun">
— Function: double <b>gsl_interp_eval_deriv2</b> (<var>const gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, double x, gsl_interp_accel * acc</var>)<var><a name="index-gsl_005finterp_005feval_005fderiv2-2102"></a></var><br>
— Function: int <b>gsl_interp_eval_deriv2_e</b> (<var>const gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, double x, gsl_interp_accel * acc, double * d2</var>)<var><a name="index-gsl_005finterp_005feval_005fderiv2_005fe-2103"></a></var><br>
<blockquote><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></blockquote></div>
<div class="defun">
— Function: double <b>gsl_interp_eval_integ</b> (<var>const gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, double a, double b, gsl_interp_accel * acc</var>)<var><a name="index-gsl_005finterp_005feval_005finteg-2104"></a></var><br>
— Function: int <b>gsl_interp_eval_integ_e</b> (<var>const gsl_interp * interp, const double xa</var>[]<var>, const double ya</var>[]<var>, double a, double b, gsl_interp_accel * acc, double * result</var>)<var><a name="index-gsl_005finterp_005feval_005finteg_005fe-2105"></a></var><br>
<blockquote><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></blockquote></div>
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