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NAG Toolbox

NAG Toolbox: nag_opt_qpconvex2_sparse_option_string (e04ns)

 Contents

    1  Purpose
    2  Syntax
    7  Accuracy
    9  Example

Purpose

nag_opt_qpconvex2_sparse_option_string (e04ns) may be used to supply individual optional parameters to nag_opt_qpconvex2_sparse_solve (e04nq). The initialization function nag_opt_qpconvex2_sparse_init (e04np) must have been called before calling nag_opt_qpconvex2_sparse_option_string (e04ns).

Syntax

[cw, iw, rw, ifail] = e04ns(string, cw, iw, rw)
[cw, iw, rw, ifail] = nag_opt_qpconvex2_sparse_option_string(string, cw, iw, rw)

Description

nag_opt_qpconvex2_sparse_option_string (e04ns) may be used to supply values for optional parameters to nag_opt_qpconvex2_sparse_solve (e04nq). It is only necessary to call nag_opt_qpconvex2_sparse_option_string (e04ns) for those arguments whose values are to be different from their default values. One call to nag_opt_qpconvex2_sparse_option_string (e04ns) sets one argument value.
Each optional parameter is defined by a single character string, of up to 72 characters, 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 parameter. 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 in Fortran's I, F, E or D formats, terminated by a space if this is not the last item on the line.
For nag_opt_qpconvex2_sparse_option_string (e04ns), 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
[cw, iw, rw, ifail] = e04ns('List', cw, iw, rw);
turns on printing of this and subsequent options. Printing may be turned off again using the keyword Nolist.
Optional parameter settings are preserved following a call to nag_opt_qpconvex2_sparse_solve (e04nq) 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_qpconvex2_sparse_solve (e04nq).
A complete list of optional parameters, their abbreviations, synonyms and default values is given in Optional Parameters in nag_opt_qpconvex2_sparse_solve (e04nq).

References

None.

Parameters

Compulsory Input Parameters

1:     string – string
A single valid option string (see Description in nag_opt_qpconvex2_sparse_option_string (e04ns) and Optional Parameters in nag_opt_qpconvex2_sparse_solve (e04nq)).
2:     cw: – cell array of strings
The dimension of the array cw must be at least lencw (see nag_opt_qpconvex2_sparse_init (e04np))
3:     iw: int64int32nag_int array
The dimension of the array iw must be at least leniw (see nag_opt_qpconvex2_sparse_init (e04np))
4:     rw: – double array
The dimension of the array rw must be at least lenrw (see nag_opt_qpconvex2_sparse_init (e04np))

Optional Input Parameters

None.

Output Parameters

1:     cw: – cell array of strings
The dimension of the array cw will be lencw (see nag_opt_qpconvex2_sparse_init (e04np))
2:     iw: int64int32nag_int array
The dimension of the array iw will be leniw (see nag_opt_qpconvex2_sparse_init (e04np))
3:     rw: – double array
The dimension of the array rw will be lenrw (see nag_opt_qpconvex2_sparse_init (e04np))
4:     ifail int64int32nag_int scalar
ifail=0 unless the function detects an error (see Error Indicators and Warnings).

Error Indicators and Warnings

Errors or warnings detected by the function:
   ifail=1
The initialization function nag_opt_qpconvex2_sparse_init (e04np) has not been called.
   ifail=2
The supplied option is invalid. Check that the keywords are neither ambiguous nor misspelt.
   ifail=-99
An unexpected error has been triggered by this routine. Please contact NAG.
   ifail=-399
Your licence key may have expired or may not have been installed correctly.
   ifail=-999
Dynamic memory allocation failed.

Accuracy

Not applicable.

Further Comments

nag_opt_qpconvex2_sparse_option_integer_set (e04nt) or nag_opt_qpconvex2_sparse_option_double_set (e04nu) may also be used to supply optional parameters to nag_opt_qpconvex2_sparse_solve (e04nq).

Example

function e04ns_example


fprintf('e04ns example results\n\n');

string = 'Iterations limit 50';
% Initialize
[cw, iw, rw, ifail] = e04np;
% Set option
[cw, iw, rw, ifail] = e04ns( ...
                             'Iterations limit 50', cw, iw, rw);
% Get option value
[ivalue, cw, iw, rw, ifail] = e04nx( ...
                                     'Iterations limit', cw, iw, rw);
fprintf('Iterations limit has been set to %4d\n',ivalue);


e04ns example results

Iterations limit has been set to   50

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