NAG Library Function Document

nag_opt_sparse_convex_qp_option_set_double (e04nuc)

+− 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_sparse_convex_qp_option_set_double (e04nuc) may be used to supply individual double optional arguments 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 arguments 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 argument 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 argument 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 arguments to their default values before a subsequent call to nag_opt_sparse_convex_qp_solve (e04nqc).

A complete list of optional arguments, 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 argument (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 3.6 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 ‘ $⟨value⟩$ ’ and $rvalue = ⟨value⟩$ .
NE_E04NPC_NOT_INIT: 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.