NAG AD Library Routine Document

e02bb_a1w_f (dim1_spline_eval_a1w)


Note: _a1w_ denotes that first order adjoints are computed in working precision; this has the corresponding argument type nagad_a1w_w_rtype. Further implementations, for example for higher order differentiation or using the tangent linear approach, may become available at later marks of the NAG AD Library. The method of codifying AD implementations in routine name and corresponding argument types is described in the NAG AD Library Introduction.

1
Purpose

e02bb_a1w_f is the adjoint version of the primal routine e02bbf .

2
Specification

Fortran Interface
Subroutine e02bb_a1w_f (ad_handle, ncap7, lamda, c, x, s, ifail)
Integer, Intent (In):: ncap7
Integer, Intent (Inout):: ifail
Type (nagad_a1w_w_rtype), Intent (In):: lamda(ncap7), c(ncap7), x
Type (nagad_a1w_w_rtype), Intent (Out):: s
Type (c_ptr), Intent (In):: ad_handle
C++ Header Interface
#include <nagad.h>
void e02bb_a1w_f_ (void *&ad_handle, const Integer &ncap7, nagad_a1w_w_rtype lamda[], nagad_a1w_w_rtype c[], const nagad_a1w_w_rtype &x, nagad_a1w_w_rtype &s, Integer &ifail)

3
Description

e02bbf evaluates a cubic spline from its B-spline representation. For further information see Section 3 in the documentation for e02bbf .

4
References

None.

5
Arguments

e02bb_a1w_f provides access to all the arguments available in the primal routine. There are also additional arguments specific to AD. A tooltip popup for each argument can be found by hovering over the argument name in Section 2 and a summary of the arguments are provided below:

6
Error Indicators and Warnings

e02bb_a1w_f preserves all error codes from e02bbf and in addition can return:
ifail=-89
An unexpected AD error has been triggered by this routine. Please contact NAG.
See Section 5.2 in the NAG AD Library Introduction for further information.
ifail=-899
Dynamic memory allocation failed for AD.
See Section 5.1 in the NAG AD Library Introduction for further information.

7
Accuracy

Not applicable.

8
Parallelism and Performance

e02bb_a1w_f is not threaded in any implementation.

9
Further Comments

None.

10
Example

The following examples are variants of the example for e02bbf , modified to demonstrate calling the NAG AD Library.
LanguageSource FileDataResults
Fortane02bb_a1w_fe.f90Nonee02bb_a1w_fe.r
C++e02bb_a1w_hcppe.cppNonee02bb_a1w_hcppe.r