NAG Library Function Document

nag_opt_nlp_option_set_string (e04wfc)

+− Contents

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

6 Error Indicators and Warnings

7 Accuracy

8 Parallelism and Performance

9 Further Comments

10 Example

1 Purpose

nag_opt_nlp_option_set_string (e04wfc) may be used to supply individual optional arguments to nag_opt_nlp_solve (e04wdc). The initialization function nag_opt_nlp_init (e04wcc) must have been called before calling nag_opt_nlp_option_set_string (e04wfc).

2 Specification

#include <nag.h>

#include <nage04.h>

void	nag_opt_nlp_option_set_string (const char string, Nag_E04State state, NagError *fail)

3 Description

nag_opt_nlp_option_set_string (e04wfc) may be used to supply values for optional arguments to nag_opt_nlp_solve (e04wdc). It is only necessary to call nag_opt_nlp_option_set_string (e04wfc) for those arguments whose values are to be different from their default values. One call to nag_opt_nlp_option_set_string (e04wfc) sets one argument value.

Each optional argument is defined by a single character string, consisting of one or more items. The items associated with a given option must be separated by spaces, or equals signs

[=]

. Alphabetic characters may be upper or lower case. The string

Print Level = 1

is an example of a string used to set an optional argument. For each option the string contains one or more of the following items:

–	a mandatory keyword;
–	a phrase that qualifies the keyword;
–	a number that specifies an Integer or double value. Such numbers may be up to $16$ contiguous characters which can be read using C's d or g formats, terminated by a space if this is not the last item on the line.

For nag_opt_nlp_option_set_string (e04wfc), each user-specified option is not normally printed as it is defined, but this printing may be turned on using the keyword

List

. Thus the statement

e04wfc ("List", &state, &fail);

turns on printing of this and subsequent options. Printing may be turned off again using the keyword

Nolist

Optional argument settings are preserved following a call to nag_opt_nlp_solve (e04wdc) and so the keyword

Defaults

is provided to allow you to reset all the optional arguments to their default values before a subsequent call to nag_opt_nlp_solve (e04wdc).

A complete list of optional arguments, their abbreviations, synonyms and default values is given in Section 12 in nag_opt_nlp_solve (e04wdc).

4 References

None.

5 Arguments

1: string – const char *Input: On entry: a single valid option string (see Section 3 in nag_opt_nlp_option_set_string (e04wfc) and Section 12 in nag_opt_nlp_solve (e04wdc)).
2: state – Nag_E04State *Communication Structure: state contains internal information required for functions in this suite. It must not be modified in any way.
3: fail – NagError *Input/Output: The NAG error argument (see Section 3.6 in the Essential Introduction).

6 Error Indicators and Warnings

NE_BAD_PARAM: On entry, argument $⟨value⟩$ had an illegal value.
NE_E04_OPTION_INVALID: The supplied option is invalid. Check that the keywords are neither ambiguous nor misspelt. The option string is ‘ $⟨value⟩$ ’.
NE_E04WCC_NOT_INIT: Initialization function nag_opt_nlp_init (e04wcc) has not been called.
NE_INTERNAL_ERROR: An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.