e04tb is the AD Library version of the primal routine e04tbf. Based (in the C++ interface) on overload resolution, e04tb can be used for primal, tangent and adjoint evaluation. It supports tangents and adjoints of first order.

2 Specification

C++ Interface

#include <dco.hpp>
#include <nagad.h>
namespace nag {
namespace ad {

void e04tb (

handle_t &ad_handle, void *handle, const char *comp, const Integer &lidx, const Integer idx[], Integer &ifail)

}
}

The function is overloaded on ADTYPE which represents the type of active arguments. ADTYPE may be any of the following types:
double,
dco::ga1s<double>::type,
dco::gt1s<double>::type

Note: this function can be used with AD tools other than dco/c++. For details, please contact NAG.

3 Description

e04tb is the AD Library version of the primal routine e04tbf.

e04tbf is a part of the NAG optimization modelling suite and allows you to enable various components of the existing model which were previously disabled by e04tcf. For further information see Section 3 in the documentation for e04tbf.

4 References

5 Arguments

In addition to the arguments present in the interface of the primal routine, e04tb 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 – nag::ad::handle_t Input/Output: On entry: a configuration object that holds information on the differentiation strategy. Details on setting the AD strategy are described in AD handle object in the NAG AD Library Introduction.
2: handle – Type(c_ptr) Input
3: comp – character Input
4: lidx – Integer Input
5: idx(lidx) – Integer array Input
6: ifail – Integer Input/Output

6 Error Indicators and Warnings

e04tb preserves all error codes from e04tbf and in addition can return:

$ifail = - 89$: An unexpected AD error has been triggered by this routine. Please contact NAG.
See Error Handling in the NAG AD Library Introduction for further information.

$ifail = - 199$: The routine was called using a strategy that has not yet been implemented.
See AD Strategies in the NAG AD Library Introduction for further information.

$ifail = - 444$: A C++ exception was thrown.
The error message will show the details of the C++ exception text.

$ifail = - 899$: Dynamic memory allocation failed for AD.
See Error Handling in the NAG AD Library Introduction for further information.

7 Accuracy

Not applicable.

8 Parallelism and Performance

e04tb is not threaded in any implementation.

9 Further Comments

None.

10 Example

See e04tc.

NAG Library Manual, Mark 30.3

Interfaces: FL CL CPP AD

NAG AD Library Introduction

E04 (Opt) Chapter Contents

E04 (Opt) Chapter Introduction (FL)

e04tb: FL CL CPP AD

when ADTYPE is	Real(kind=nag_wp)	then AD is p0w
when ADTYPE is	Type(nagad_a1w_w_rtype)	then AD is a1w
when ADTYPE is	Type(nagad_t1w_w_rtype)	then AD is t1w

NAG AD Librarye04tb (handle_enable)

▸▿ Contents

1 Purpose