NAG AD Library
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 the routine name and corresponding argument types is described in the NAG AD Library Introduction.

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NAG Library Manual, Mark 27

Interfaces: FL CL CPP AD

NAG AD Library Introduction

E02 (Fit) Chapter Contents

E02 (Fit) Chapter Introduction (FL)

e02bb: FL CL CPP AD

▸▿ Contents

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

6 Error Indicators and Warnings

7 Accuracy

8 Parallelism and Performance

9 Further Comments

10 Example

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)

The routine may be called by the names e02bb_a1w_f or nagf_fit_dim1_spline_eval_a1w.

3 Description

e02bb_a1w_f is the adjoint version of the primal routine e02bbf.

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

In addition to the arguments present in the interface of the primal routine, e02bb_a1w_f includes some arguments specific to AD.

A brief summary of the AD specific arguments is given below. For the remainder, links are provided to the corresponding argument from the primal routine. A tooltip popup for all arguments can be found by hovering over the argument name in Section 2 and in this section.

1: ad_handle – Type (c_ptr) Input: On entry: a handle to the AD configuration data object, as created by x10aa_a1w_f.
2: ncap7 – Integer Input
3: lamda(ncap7) – Type (nagad_a1w_w_rtype) array Input
4: c(ncap7) – Type (nagad_a1w_w_rtype) array Input
5: x – Type (nagad_a1w_w_rtype) Input
6: s – Type (nagad_a1w_w_rtype) Output
7: ifail – Integer Input/Output

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 4.5.2 in the NAG AD Library Introduction for further information.