NAG Library Manual, Mark 27.1
Interfaces:  FL   CL   CPP   AD 
NAG AD Library Introduction
E04 (Opt) Chapter Contents
E04 (Opt) Chapter Introduction (FL)
e04ta:  FL   CL   CPP   AD 

NAG AD Library
e04ta_a1w_f (handle_add_vars_a1w)

Note: a1w denotes that first order adjoints are computed in working precision; this has the corresponding argument type nagad_a1w_w_rtype. Also available is the t1w (first order tangent linear) mode, the interface of which is implied by replacing a1w by t1w throughout this document. Additionally, the p0w (passive interface, as alternative to the FL interface) mode is available and can be inferred by replacing of active types by the corresponding passive types. The method of codifying AD implementations in the routine name and corresponding argument types is described in the NAG AD Library Introduction.
NAG Library Manual, Mark 27.1
Interfaces:  FL   CL   CPP   AD 
NAG AD Library Introduction
E04 (Opt) Chapter Contents
E04 (Opt) Chapter Introduction (FL)
e04ta:  FL   CL   CPP   AD 

▸▿ Contents

© The Numerical Algorithms Group Ltd. 2020
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1 Purpose

e04ta_a1w_f is the adjoint version of the primal routine e04taf.

2 Specification

Fortran Interface
Subroutine e04ta_a1w_f ( ad_handle, handle, nadd, nvar, ifail)
Integer, Intent (In) :: nadd
Integer, Intent (Inout) :: ifail
Integer, Intent (Out) :: nvar
Type (c_ptr), Intent (Inout) :: ad_handle
Type (c_ptr), Intent (In) :: handle
C++ Header Interface
#include <nagad.h>
void e04ta_a1w_f_ ( void *&ad_handle, void *handle, const Integer &nadd, Integer &nvar, Integer &ifail)
The routine may be called by the names e04ta_a1w_f or nagf_opt_handle_add_vars_a1w. The corresponding t1w and p0w variants of this routine are also available.

3 Description

e04ta_a1w_f is the adjoint version of the primal routine e04taf.
e04taf is a part of the NAG optimization modelling suite and adds new variables to the problem. For further information see Section 3 in the documentation for e04taf.

4 References

5 Arguments

In addition to the arguments present in the interface of the primal routine, e04ta_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/Output
On entry: a handle to the AD configuration data object, as created by x10aa_a1w_f.
2: handle – Type(c_ptr) Input
3: nadd – Integer Input
4: nvar – Integer Output
5: ifail – Integer Input/Output

6 Error Indicators and Warnings

e04ta_a1w_f preserves all error codes from e04taf and in addition can return:
ifail=-89
An unexpected AD error has been triggered by this routine. Please contact NAG.
See Section 4.8.2 in the NAG AD Library Introduction for further information.
ifail=-899
Dynamic memory allocation failed for AD.
See Section 4.8.1 in the NAG AD Library Introduction for further information.

7 Accuracy

Not applicable.

8 Parallelism and Performance

e04ta_a1w_f is not threaded in any implementation.

9 Further Comments

None.

10 Example

A NAG AD Library example is not yet available, please refer to the NAG AD Library Introduction for information on calling routines from the AD Library.
NAG Library Manual, Mark 27.1
Interfaces:  FL   CL   CPP   AD 
NAG AD Library Introduction
E04 (Opt) Chapter Contents
E04 (Opt) Chapter Introduction (FL)
e04ta:  FL   CL   CPP   AD 
© The Numerical Algorithms Group Ltd. 2020