initializes the structure options
. This structure is used by some functions in Chapter G13
. This function must be called before any direct assignments are made to members of the options structure.
A number of optional parameters are applicable to several functions in Chapter G13
. These arguments are set by means of a structure of type Nag_G13_Opt. This initialization function sets the members of the structure to null values indicating that the default values should be used for these arguments. If argument values other than the default values are required, they must be assigned to the appropriate members of the options structure in the calling program.