NAG C Library Function Document

nag_opt_nlp_option_set_integer (e04wgc)

1
Purpose

nag_opt_nlp_option_set_integer (e04wgc) may be used to supply individual Integer optional parameters 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_integer (e04wgc).

2
Specification

#include <nag.h>
#include <nage04.h>
void  nag_opt_nlp_option_set_integer (const char *string, Integer ivalue, Nag_E04State *state, NagError *fail)

3
Description

nag_opt_nlp_option_set_integer (e04wgc) may be used to supply values for Integer optional parameters to nag_opt_nlp_solve (e04wdc). It is only necessary to call nag_opt_nlp_option_set_integer (e04wgc) for those arguments whose values are to be different from their default values. One call to nag_opt_nlp_option_set_integer (e04wgc) 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;
e04wgc ("Iterations", itnlim, &state, &fail);
Optional parameter 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 parameters to their default values before a subsequent call to nag_opt_nlp_solve (e04wdc).
A complete list of optional parameters, 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 keyword of an Integer optional parameter (as described in Section 12 in nag_opt_nlp_solve (e04wdc)).
2:     ivalue IntegerInput
On entry: an Integer value associated with the keyword in string.
3:     state Nag_E04State *Communication Structure
state contains internal information required for functions in this suite. It must not be modified in any way.
4:     fail NagError *Input/Output
The NAG error argument (see Section 3.7 in How to Use the NAG Library and its Documentation).

6
Error Indicators and Warnings

NE_ALLOC_FAIL
Dynamic memory allocation failed.
See Section 2.3.1.2 in How to Use the NAG Library and its Documentation for further information.
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’ and ivalue=value.
NE_E04WCC_NOT_INIT
The 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.
See Section 2.7.6 in How to Use the NAG Library and its Documentation for further information.
NE_NO_LICENCE
Your licence key may have expired or may not have been installed correctly.
See Section 2.7.5 in How to Use the NAG Library and its Documentation for further information.

7
Accuracy

Not applicable.

8
Parallelism and Performance

nag_opt_nlp_option_set_integer (e04wgc) is not threaded in any implementation.

9
Further Comments

nag_opt_nlp_option_set_file (e04wec) or nag_opt_nlp_option_set_string (e04wfc) may also be used to supply Integer optional parameters to nag_opt_nlp_solve (e04wdc).

10
Example

See Section 10 in nag_opt_nlp_solve (e04wdc) and nag_opt_nlp_option_set_file (e04wec).