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Next: <a href="2D-Higher_002dlevel-Interface.html#g_t2D-Higher_002dlevel-Interface" accesskey="n" rel="next">2D Higher-level Interface</a>, Previous: <a href="2D-Interpolation-Types.html#g_t2D-Interpolation-Types" accesskey="p" rel="previous">2D Interpolation Types</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_t2D-Evaluation-of-Interpolating-Functions-1"></a>
<h3 class="section">28.13 2D Evaluation of Interpolating Functions</h3>

<dl>
<dt><a name="index-gsl_005finterp2d_005feval"></a>Function: <em>double</em> <strong>gsl_interp2d_eval</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>)</em></dt>
<dt><a name="index-gsl_005finterp2d_005feval_005fe"></a>Function: <em>int</em> <strong>gsl_interp2d_eval_e</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>, double * <var>z</var>)</em></dt>
<dd><p>These functions return the interpolated value of <var>z</var> for a given
point (<var>x</var>,<var>y</var>), using the interpolation object <var>interp</var>, data
arrays <var>xa</var>, <var>ya</var>, and <var>za</var> and the accelerators <var>xacc</var>
and <var>yacc</var>.  When <var>x</var> is outside the range of <var>xa</var> or <var>y</var>
is outside the range of <var>ya</var>, the error code
<code>GSL_EDOM</code> is returned.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005feval_005fextrap"></a>Function: <em>double</em> <strong>gsl_interp2d_eval_extrap</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>)</em></dt>
<dt><a name="index-gsl_005finterp2d_005feval_005fextrap_005fe"></a>Function: <em>int</em> <strong>gsl_interp2d_eval_extrap_e</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>, double * <var>z</var>)</em></dt>
<dd><p>These functions return the interpolated value of <var>z</var> for a given
point (<var>x</var>,<var>y</var>), using the interpolation object <var>interp</var>, data
arrays <var>xa</var>, <var>ya</var>, and <var>za</var> and the accelerators <var>xacc</var>
and <var>yacc</var>. The functions perform no bounds checking, so
when <var>x</var> is outside the range of <var>xa</var> or <var>y</var>
is outside the range of <var>ya</var>, extrapolation is performed.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fx"></a>Function: <em>double</em> <strong>gsl_interp2d_eval_deriv_x</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>)</em></dt>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fx_005fe"></a>Function: <em>int</em> <strong>gsl_interp2d_eval_deriv_x_e</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>, double * <var>d</var>)</em></dt>
<dd><p>These functions return the interpolated value <var>d</var>
<em>= \partial z / \partial x</em> for a given point (<var>x</var>,<var>y</var>),
using the interpolation object <var>interp</var>, data
arrays <var>xa</var>, <var>ya</var>, and <var>za</var> and the accelerators <var>xacc</var>
and <var>yacc</var>.  When <var>x</var> is outside the range of <var>xa</var> or <var>y</var>
is outside the range of <var>ya</var>, the error code
<code>GSL_EDOM</code> is returned.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fy"></a>Function: <em>double</em> <strong>gsl_interp2d_eval_deriv_y</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>)</em></dt>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fy_005fe"></a>Function: <em>int</em> <strong>gsl_interp2d_eval_deriv_y_e</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>, double * <var>d</var>)</em></dt>
<dd><p>These functions return the interpolated value <var>d</var>
<em>= \partial z / \partial y</em> for a given point (<var>x</var>,<var>y</var>),
using the interpolation object <var>interp</var>, data
arrays <var>xa</var>, <var>ya</var>, and <var>za</var> and the accelerators <var>xacc</var>
and <var>yacc</var>.  When <var>x</var> is outside the range of <var>xa</var> or <var>y</var>
is outside the range of <var>ya</var>, the error code
<code>GSL_EDOM</code> is returned.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fxx"></a>Function: <em>double</em> <strong>gsl_interp2d_eval_deriv_xx</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>)</em></dt>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fxx_005fe"></a>Function: <em>int</em> <strong>gsl_interp2d_eval_deriv_xx_e</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>, double * <var>d</var>)</em></dt>
<dd><p>These functions return the interpolated value <var>d</var>
<em>= \partial^2 z / \partial x^2</em> for a given point (<var>x</var>,<var>y</var>),
using the interpolation object <var>interp</var>, data
arrays <var>xa</var>, <var>ya</var>, and <var>za</var> and the accelerators <var>xacc</var>
and <var>yacc</var>.  When <var>x</var> is outside the range of <var>xa</var> or <var>y</var>
is outside the range of <var>ya</var>, the error code
<code>GSL_EDOM</code> is returned.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fyy"></a>Function: <em>double</em> <strong>gsl_interp2d_eval_deriv_yy</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>)</em></dt>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fyy_005fe"></a>Function: <em>int</em> <strong>gsl_interp2d_eval_deriv_yy_e</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>, double * <var>d</var>)</em></dt>
<dd><p>These functions return the interpolated value <var>d</var>
<em>= \partial^2 z / \partial y^2</em> for a given point (<var>x</var>,<var>y</var>),
using the interpolation object <var>interp</var>, data
arrays <var>xa</var>, <var>ya</var>, and <var>za</var> and the accelerators <var>xacc</var>
and <var>yacc</var>.  When <var>x</var> is outside the range of <var>xa</var> or <var>y</var>
is outside the range of <var>ya</var>, the error code
<code>GSL_EDOM</code> is returned.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fxy"></a>Function: <em>double</em> <strong>gsl_interp2d_eval_deriv_xy</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>)</em></dt>
<dt><a name="index-gsl_005finterp2d_005feval_005fderiv_005fxy_005fe"></a>Function: <em>int</em> <strong>gsl_interp2d_eval_deriv_xy_e</strong> <em>(const gsl_interp2d * <var>interp</var>, const double <var>xa</var>[], const double <var>ya</var>[], const double <var>za</var>[], const double <var>x</var>, const double <var>y</var>, gsl_interp_accel * <var>xacc</var>, gsl_interp_accel * <var>yacc</var>, double * <var>d</var>)</em></dt>
<dd><p>These functions return the interpolated value <var>d</var>
<em>= \partial^2 z / \partial x \partial y</em> for a given point (<var>x</var>,<var>y</var>),
using the interpolation object <var>interp</var>, data
arrays <var>xa</var>, <var>ya</var>, and <var>za</var> and the accelerators <var>xacc</var>
and <var>yacc</var>.  When <var>x</var> is outside the range of <var>xa</var> or <var>y</var>
is outside the range of <var>ya</var>, the error code
<code>GSL_EDOM</code> is returned.
</p></dd></dl>

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Next: <a href="2D-Higher_002dlevel-Interface.html#g_t2D-Higher_002dlevel-Interface" accesskey="n" rel="next">2D Higher-level Interface</a>, Previous: <a href="2D-Interpolation-Types.html#g_t2D-Interpolation-Types" accesskey="p" rel="previous">2D Interpolation Types</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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