Functions in Chapter X04 must be used to associate a file name with the file ID. Nag_FileID This data type is an integer type used by certain NAG Library functions which deal with input or output files. Nag_User This is also a communication structure with a generic pointer with usage similar to Nag_Comm. For an example of use, please see Section 10 in e04cbc. The use of Integer and double pointers allows double and Integer arrays to be communicated with no casting. This avoids the necessity of using global variables for such communication.
Nag_Comm This data type is a structure with a number of fields among which are a generic pointer, an Integer pointer and a double pointer which may be used for communicating information between a user-defined function and your calling program, where the user-defined function is supplied as an argument to the NAG function.
Typedef enum Complex Pointer This data type represents the generic pointer void *. Nag_Boolean This is an enumeration type defined as Please refer to the Users' Note for its exact type. 3.1.1 NAG data types Integer This data type is used for integer arguments to NAG Library functions. The file nag.h defines data types and error codes used in the NAG Library together with a number of macros used in example programs.
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