NAG C Library Function Document

nag_opt_sparse_convex_qp_option_set_double (e04nuc) may be used to supply individual double optional parameters to nag_opt_sparse_convex_qp_solve (e04nqc). The initialization function nag_opt_sparse_convex_qp_init (e04npc) must have been called before calling nag_opt_sparse_convex_qp_option_set_double (e04nuc).

2

Specification

#include <nag.h>

#include <nage04.h>

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

3

Description

nag_opt_sparse_convex_qp_option_set_double (e04nuc) may be used to supply values for double optional parameters to nag_opt_sparse_convex_qp_solve (e04nqc). It is only necessary to call nag_opt_sparse_convex_qp_option_set_double (e04nuc) for those arguments whose values are to be different from their default values. One call to nag_opt_sparse_convex_qp_option_set_double (e04nuc) 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;
e04nuc ("LU Factor Tolerance", factol, &state, &fail);

Optional parameter settings are preserved following a call to nag_opt_sparse_convex_qp_solve (e04nqc) 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_sparse_convex_qp_solve (e04nqc).

A complete list of optional parameters, their abbreviations, synonyms and default values is given in Section 12 in nag_opt_sparse_convex_qp_solve (e04nqc).

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 nag_opt_sparse_convex_qp_solve (e04nqc)).
2: $rvalue$ – doubleInput: 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 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 $rvalue = 〈value〉$ .
NE_E04NPC_NOT_INIT: The initialization function nag_opt_sparse_convex_qp_init (e04npc) 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.