NAG CL Interface
e01shc (dim2_​scat_​shep_​eval)

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

1: $\mathbf{m}$ – Integer Input

2: $\mathbf{x}\left[\mathbf{m}\right]$ – const double Input

3: $\mathbf{y}\left[\mathbf{m}\right]$ – const double Input

4: $\mathbf{f}\left[\mathbf{m}\right]$ – const double Input

On entry: m, x, y and f must be the same values as were supplied in the preceding call to e01sgc.

5: $\mathbf{iq}\left[\mathit{dim}\right]$ – const Integer Input

On entry: must be unchanged from the value returned from a previous call to e01sgc.

6: $\mathbf{rq}\left[\mathit{dim}\right]$ – const double Input

On entry: must be unchanged from the value returned from a previous call to e01sgc.

7: $\mathbf{n}$ – Integer Input

On entry: $n$, the number of evaluation points.

Constraint: $\mathbf{n}\ge 1$.

8: $\mathbf{u}\left[\mathbf{n}\right]$ – const double Input

9: $\mathbf{v}\left[\mathbf{n}\right]$ – const double Input

On entry: the evaluation points $\left(u_{\mathit{i}},v_{\mathit{i}}\right)$, for $\mathit{i}=1,2,\dots ,n$.

10: $\mathbf{q}\left[\mathbf{n}\right]$ – double Output

On exit: the values of the interpolant at $\left(u_{\mathit{i}},v_{\mathit{i}}\right)$, for $\mathit{i}=1,2,\dots ,n$. If any of these evaluation points lie outside the region of definition of the interpolant the corresponding entries in q are set to the largest machine representable number (see X02ALC), and e01shc returns with $\mathbf{fail}\mathbf{.}\mathbf{code}=$ NE_BAD_INTERPOLANT.

11: $\mathbf{qx}\left[\mathbf{n}\right]$ – double Output

12: $\mathbf{qy}\left[\mathbf{n}\right]$ – double Output

On exit: the values of the partial derivatives of the interpolant $Q\left(x,y\right)$ at $\left(u_{\mathit{i}},v_{\mathit{i}}\right)$, for $\mathit{i}=1,2,\dots ,n$. If any of these evaluation points lie outside the region of definition of the interpolant, the corresponding entries in qx and qy are set to the largest machine representable number (see X02ALC), and e01shc returns with $\mathbf{fail}\mathbf{.}\mathbf{code}=$ NE_BAD_INTERPOLANT.

13: $\mathbf{fail}$ – NagError * Input/Output

The NAG error argument (see Section 7 in the Introduction to the NAG Library CL Interface).

6 Error Indicators and Warnings

NE_ALLOC_FAIL

Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface for further information.

NE_BAD_INTERPOLANT

On entry, at least one evaluation point lies outside the region of definition of the interpolant. At such points the corresponding values in q and qx contain extrapolated approximations. Points should be evaluated one by one to identify extrapolated values.

NE_BAD_PARAM

On entry, argument $〈\mathit{\text{value}}〉$ had an illegal value.

NE_INT

On entry, $\mathbf{m}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{m}\ge 6$.

On entry, $\mathbf{n}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{n}\ge 1$.

NE_INTERNAL_ERROR

An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.
See Section 7.5 in the Introduction to the NAG Library CL Interface for further information.

NE_INVALID_ARRAY

On entry, values in iq appear to be invalid. Check that iq has not been corrupted between calls to e01sgc and e01shc.

On entry, values in rq appear to be invalid. Check that rq has not been corrupted between calls to e01sgc and e01shc.

NE_NO_LICENCE

Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library CL Interface for further information.

7 Accuracy

8 Parallelism and Performance

9 Further Comments

10 Example