e04whc may be used to supply individual double optional parameters to e04wdc. The initialization function e04wcc must have been called before calling e04whc.

2 Specification

#include <nag.h>

void	e04whc (const char string, double rvalue, Nag_E04State state, NagError *fail)

The function may be called by the names: e04whc, nag_opt_nlp2_option_double_set or nag_opt_nlp_option_set_double.

3 Description

e04whc may be used to supply values for double optional parameters to e04wdc. It is only necessary to call e04whc for those arguments whose values are to be different from their default values. One call to e04whc sets one argument value.

Each double optional parameter is defined by a single character string in string and the corresponding value in rvalue. For example the following illustrates how the

L U

stability tolerance could be defined:

factol = 100.0;
if (illcon) factol = 5.0;
e04whc ("LU Factor Tolerance", factol, &state, &fail);

Optional parameter settings are preserved following a call to 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 e04wdc.

A complete list of optional parameters, their abbreviations, synonyms and default values is given in Section 12 in e04wdc.

4 References

None.

5 Arguments

1: $string$ – const char * Input: On entry: a single valid keyword of a double optional parameter (as described in Section 12 in e04wdc).
2: $rvalue$ – double Input: On entry: the 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 7 in the Introduction to the NAG Library CL Interface).

6 Error Indicators and Warnings

NE_ALLOC_FAIL: Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface 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 $rvalue = ⟨ value ⟩$ .
NE_E04WCC_NOT_INIT: The initialization function 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 7.5 in the Introduction to the NAG Library CL Interface for further information.
NE_NO_LICENCE: Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library CL Interface for further information.