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## 1Purpose

e04tc is the AD Library version of the primal routine e04tcf. Based (in the C++ interface) on overload resolution, e04tc can be used for primal, tangent and adjoint evaluation. It supports tangents and adjoints of first order.

## 2Specification

Fortran Interface
 Integer, Intent (In) :: lidx, idx(lidx) Integer, Intent (Inout) :: ifail Character (*), Intent (In) :: comp Type (c_ptr), Intent (Inout) :: ad_handle Type (c_ptr), Intent (In) :: 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 e04tc ( void *&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

## 3Description

e04tc is the AD Library version of the primal routine e04tcf.
e04tcf is a part of the NAG optimization modelling suite and allows you to disable various components of an existing model. For further information see Section 3 in the documentation for e04tcf.

## 5Arguments

In addition to the arguments present in the interface of the primal routine, e04tc 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: handle – Type(c_ptr) Input
3: comp – character Input
4: lidx – Integer Input
5: idx(lidx) – Integer array Input
6: ifail – Integer Input/Output

## 6Error Indicators and Warnings

e04tc preserves all error codes from e04tcf 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

e04tc is not threaded in any implementation.