e04wb (nlp1_init) : NAG AD Library Routine Document, Mark 27

e04wb is the AD Library version of the primal routine e04wbf. Based (in the C++ interface) on overload resolution, e04wb can be used for primal, tangent and adjoint evaluation. It supports tangents and adjoints of first and second order.

2 Specification

Fortran Interface

Subroutine e04wb_AD_f (

ad_handle, rname, cwsav, lcwsav, lwsav, llwsav, iwsav, liwsav, rwsav, lrwsav, ifail)

Integer, Intent (In)	::	lcwsav, llwsav, liwsav, lrwsav
Integer, Intent (Inout)	::	ifail
Integer, Intent (Out)	::	iwsav(liwsav)
ADTYPE, Intent (Out)	::	rwsav(lrwsav)
Logical, Intent (Out)	::	lwsav(llwsav)
Character (*), Intent (In)	::	rname
Character (80), Intent (Out)	::	cwsav(lcwsav)
Type (c_ptr), Intent (Inout)	::	ad_handle

Corresponding to the overloaded C++ function, the Fortran interface provides five routines with names reflecting the type used for active real arguments. The actual subroutine and type names are formed by replacing AD and ADTYPE in the above as follows:

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
when ADTYPE is	Type(nagad_a1t1w_w_rtype)	then AD is a1t1w
when ADTYPE is	Type(nagad_t2w_w_rtype)	then AD is t2w

C++ Header Interface

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

void e04wb (

void *&ad_handle, const char *rname, char *cwsav[], const Integer &lcwsav, logical lwsav[], const Integer &llwsav, Integer iwsav[], const Integer &liwsav, ADTYPE rwsav[], const Integer &lrwsav, 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,
dco::gt1s<dco::gt1s<double>::type>::type,
dco::ga1s<dco::gt1s<double>::type>::type,

3 Description

4 References

5 Arguments

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.

6 Error Indicators and Warnings

e04wb preserves all error codes from e04wbf 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.

$ifail = - 199$: The routine was called using a mode that has not yet been implemented.

$ifail = - 443$: On entry: ad_handle is nullptr.
This check is only made if the overloaded C++ interface is used with arguments not of type double.