# NAG FL Interfacee04ntf (qpconvex2_​sparse_​option_​integer_​set)

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## 1Purpose

e04ntf may be used to supply individual integer optional parameters to e04nqf. The initialization routine e04npf must have been called before calling e04ntf.

## 2Specification

Fortran Interface
 Subroutine e04ntf ( cw, iw, rw,
 Integer, Intent (In) :: ivalue Integer, Intent (Inout) :: iw(*), ifail Real (Kind=nag_wp), Intent (Inout) :: rw(*) Character (*), Intent (In) :: string Character (8), Intent (InOut) :: cw(*)
#include <nag.h>
 void e04ntf_ (const char *st, const Integer *ivalue, char cw[], Integer iw[], double rw[], Integer *ifail, const Charlen length_st, const Charlen length_cw)
The routine may be called by the names e04ntf or nagf_opt_qpconvex2_sparse_option_integer_set.

## 3Description

e04ntf may be used to supply values for integer optional parameters to e04nqf. It is only necessary to call e04ntf for those arguments whose values are to be different from their default values. One call to e04ntf sets one argument value.
Each integer optional parameter is defined by a single character string in string and the corresponding value in ivalue. For example, the following allows the iteration limit to be defined:
itnlim = 1000
If (m > 500) itnlim = 500
Call e04ntf ('Iterations', itnlim, cw, iw, rw, ifail)
Optional parameter settings are preserved following a call to e04nqf and so the keyword Defaults is provided to allow you to reset all the optional parameters to their default values before a subsequent call to e04nqf.
A complete list of optional parameters, their abbreviations, synonyms and default values is given in Section 12 in e04nqf.

None.

## 5Arguments

1: $\mathbf{string}$Character(*) Input
On entry: a single valid keyword of an integer optional parameter (as described in Section 12 in e04nqf).
2: $\mathbf{ivalue}$Integer Input
On entry: an integer value associated with the keyword in string.
3: $\mathbf{cw}\left(*\right)$Character(8) array Communication Array
Note: the actual argument supplied must be the array cw supplied to the initialization routine e04npf.
4: $\mathbf{iw}\left(*\right)$Integer array Communication Array
Note: the actual argument supplied must be the array iw supplied to the initialization routine e04npf.
5: $\mathbf{rw}\left(*\right)$Real (Kind=nag_wp) array Communication Array
Note: the actual argument supplied must be the array rw supplied to the initialization routine e04npf.
6: $\mathbf{ifail}$Integer Input/Output
On entry: ifail must be set to $0$, $-1$ or $1$ to set behaviour on detection of an error; these values have no effect when no error is detected.
A value of $0$ causes the printing of an error message and program execution will be halted; otherwise program execution continues. A value of $-1$ means that an error message is printed while a value of $1$ means that it is not.
If halting is not appropriate, the value $-1$ or $1$ is recommended. If message printing is undesirable, then the value $1$ is recommended. Otherwise, the value $0$ is recommended. When the value $-\mathbf{1}$ or $\mathbf{1}$ is used it is essential to test the value of ifail on exit.
On exit: ${\mathbf{ifail}}={\mathbf{0}}$ unless the routine detects an error or a warning has been flagged (see Section 6).

## 6Error Indicators and Warnings

If on entry ${\mathbf{ifail}}=0$ or $-1$, explanatory error messages are output on the current error message unit (as defined by x04aaf).
Errors or warnings detected by the routine:
${\mathbf{ifail}}=1$
The initialization routine e04npf has not been called.
${\mathbf{ifail}}=2$
The supplied option is invalid. Check that the keywords are neither ambiguous nor misspelt. The option string is ‘$⟨\mathit{\text{value}}⟩$’ and ${\mathbf{ivalue}}=⟨\mathit{\text{value}}⟩$.
${\mathbf{ifail}}=-99$
See Section 7 in the Introduction to the NAG Library FL Interface for further information.
${\mathbf{ifail}}=-399$
Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library FL Interface for further information.
${\mathbf{ifail}}=-999$
Dynamic memory allocation failed.
See Section 9 in the Introduction to the NAG Library FL Interface for further information.

Not applicable.

## 8Parallelism and Performance

e04ntf is not threaded in any implementation.