NAG CL Interface
g22zmc (optset)

Note: please be advised that this function is classed as ‘experimental’ and its interface may be developed further in the future. Please see Section 4 in How to Use the NAG Library for further information.
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1 Purpose

g22zmc is a general option setting function for functions in Chapter G22. It can set a single optional parameter or reset all of them to their default.

2 Specification

#include <nag.h>
void  g22zmc (void *handle, const char *optstr, NagError *fail)
The function may be called by the names: g22zmc or nag_blgm_optset.

3 Description

g22zmc can only be called on G22 handles. Its purpose is to reset all optional parameters to their default values or set a single optional parameter to a user-supplied value.
Optional parameters and their values are, in general, presented as a character string of the form ‘option=optval’; alphabetic characters can be supplied in either upper or lower case. optval will normally be either an integer, real or character value as defined in the description of the specific optional parameter. In addition, all optional parameters can take an optval DEFAULT which resets the optional parameter to its default value.
In cases where an optional parameter may have multiple instances an instance identifier can be specified. This is presented using the form ‘option:instance identifier=optval’. In such cases, if the instance identifier is omitted, the value of all instances are changed.
Information relating to available option names, their corresponding valid values, whether the use of an instance identifier may be appropriate and what form it can take is given in the individual function documents.

4 References


5 Arguments

1: handle void * Input
On entry: the G22 handle which must have been initialized by one of Chapter G22's initialization functions.
2: optstr const char * Input
On entry: a string identifying the option, its value and, where required, the instance identifier.
Resets all options to their default values.
Sets (all instances) of option to optval.
option:instance identifier=optval
Sets a single instance of option to optval.
Resets (all instances) of option to their default value.
option:instance identifier=default
Resets a single instance of option to its default value.
optstr is case insensitive and option, instance identifier and optval may consist of one or more tokens separated by white space.
See the documentation of the individual functions in the G22 Chapter Introduction for details of valid values for option, instance identifier and optval.
3: 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

Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface for further information.
On entry, argument value had an illegal value.
handle has not been initialized or is corrupt.
handle is not a G22 handle.
Invalid instance identifier for option.
On entry, optstr=value.
Numeric instance identifier is out of range.
On entry, instance identifier=value.
Constraint: valueinstance identifier and instance identifiervalue.
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.
On entry, could not convert optval to an integer.
On entry, could not convert optval to a real.
On entry, the expected delimiter ‘=’ was not found.
On entry, option was not recognized.
On entry, optval is not a valid value for option.
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.
On entry, option is read only.
On entry, option cannot have an associated instance identifier. The supplied instance identifier was ignored.

7 Accuracy

Not applicable.

8 Parallelism and Performance

g22zmc is not threaded in any implementation.

9 Further Comments


10 Example

See the example for g22yac.