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## 1Purpose

e05jl is the AD Library version of the primal routine e05jlf. Based (in the C++ interface) on overload resolution, e05jl can be used for primal, tangent and adjoint evaluation. It supports tangents and adjoints of first order.

## 2Specification

Fortran Interface
 Integer, Intent (In) :: lcomm Integer, Intent (Inout) :: ifail ADTYPE, Intent (In) :: comm(lcomm) ADTYPE, Intent (Out) :: rvalue Character (*), Intent (In) :: optstr 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:
#include <dco.hpp>
namespace nag {
 void e05jl ( void *&ad_handle, const char *optstr, ADTYPE &rvalue, const ADTYPE comm[], const Integer &lcomm, 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

## 3Description

e05jl is the AD Library version of the primal routine e05jlf.
e05jlf is used to get the value of a real e05jbf optional parameter. e05jlf can be used before or after calling e05jbf, but the initialization routine e05jaf must have been called before calling e05jlf. For further information see Section 3 in the documentation for e05jlf.

## 5Arguments

In addition to the arguments present in the interface of the primal routine, e05jl 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.
On entry: a handle to the AD configuration data object, as created by x10aa.
2: optstr – character Input
3: Output
4: comm(lcomm) – ADTYPE array Communication Array
5: lcomm – Integer Input
6: ifail – Integer Input/Output

## 6Error Indicators and Warnings

e05jl preserves all error codes from e05jlf and in addition can return:
${\mathbf{ifail}}=-89$
See Section 4.8.2 in the NAG AD Library Introduction for further information.
${\mathbf{ifail}}=-199$
The routine was called using a mode that has not yet been implemented.
${\mathbf{ifail}}=-443$
This check is only made if the overloaded C++ interface is used with arguments not of type double.
${\mathbf{ifail}}=-444$
A C++ exception was thrown.
The error message will show the details of the C++ exception text.
${\mathbf{ifail}}=-899$
Dynamic memory allocation failed for AD.
See Section 4.8.1 in the NAG AD Library Introduction for further information.

Not applicable.

## 8Parallelism and Performance

e05jl is not threaded in any implementation.