NAG AD Library
e01ba_a1w_f (dim1_spline_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

E01 (Interp) Chapter Contents

E01 (Interp) Chapter Introduction (FL)

e01ba: 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

e01ba_a1w_f is the adjoint version of the primal routine e01baf.

2 Specification

Fortran Interface

Subroutine e01ba_a1w_f (

ad_handle, m, x, y, lamda, c, lck, wrk, lwrk, ifail)

Integer, Intent (In)	::	m, lck, lwrk
Integer, Intent (Inout)	::	ifail
Type (nagad_a1w_w_rtype), Intent (In)	::	x(m), y(m)
Type (nagad_a1w_w_rtype), Intent (Out)	::	lamda(lck), c(lck), wrk(lwrk)
Type (c_ptr), Intent (In)	::	ad_handle

C++ Header Interface

#include <nagad.h>

void e01ba_a1w_f_ (

void *&ad_handle, const Integer &m, nagad_a1w_w_rtype x[], nagad_a1w_w_rtype y[], nagad_a1w_w_rtype lamda[], nagad_a1w_w_rtype c[], const Integer &lck, nagad_a1w_w_rtype wrk[], const Integer &lwrk, Integer &ifail)

The routine may be called by the names e01ba_a1w_f or nagf_interp_dim1_spline_a1w.

3 Description

e01ba_a1w_f is the adjoint version of the primal routine e01baf.

e01baf determines a cubic spline interpolant to a given set of data. For further information see Section 3 in the documentation for e01baf.

4 References

None.

5 Arguments

In addition to the arguments present in the interface of the primal routine, e01ba_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: m – Integer Input
3: x(m) – Type (nagad_a1w_w_rtype) array Input
4: y(m) – Type (nagad_a1w_w_rtype) array Input
5: lamda(lck) – Type (nagad_a1w_w_rtype) array Output
6: c(lck) – Type (nagad_a1w_w_rtype) array Output
7: lck – Integer Input
8: wrk(lwrk) – Type (nagad_a1w_w_rtype) array Workspace
9: lwrk – Integer Input
10: ifail – Integer Input/Output

6 Error Indicators and Warnings

e01ba_a1w_f preserves all error codes from e01baf 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.