NAG Library Routine Document
To supply individual optional parameters to E04NFF/E04NFA
. More precisely, E04NHF must be used to supply optional parameters to E04NFF
and E04NHA must be used to supply optional parameters to E04NFA
E04NHA is a version of E04NHF that has additional arguments in order to make it safe for use in multithreaded applications (see Section 5
). The initialization routine E04WBF must
have been called before calling E04NHA.
2.1 Specification for E04NHF
2.2 Specification for E04NHA
E04NHF/E04NHA may be used to supply values for optional parameters to
. It is only necessary to call E04NHF/E04NHA for those arguments whose values are to be different from their default values. One call to E04NHF/E04NHA sets one argument value.
Each optional parameter is defined by a single character string,
of up to
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 real value. Such numbers may be up to 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.
Blank strings and comments are ignored. A comment begins with an asterisk (*) and all subsequent characters in the string are regarded as part of the comment.
For E04NHF, each user-specified option is normally printed as it is defined, on the current advisory message unit (see X04ABF
), but this printing may be suppressed using the keyword Nolist
. Thus the statement
CALL E04NHF ('Nolist')
suppresses printing of this and subsequent options. Printing will automatically be turned on again after a call to E04NFF
and may be turned on again at any time using the keyword List
For E04NHA printing is turned off by default, but may be turned on at any time using the keyword List
Optional parameter settings are preserved following a call to E04NFF/E04NFA
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 E04NFF/E04NFA
A complete list of optional parameters, their abbreviations, synonyms and default values is given in Section 12
- 1: – CHARACTER(*)Input
: a single valid option string (as described in Section 3
and in Section 12
- Note: the following are additional arguments for specific use with E04NHA. Users of E04NHF therefore need not read the remainder of this description.
- 2: – LOGICAL arrayCommunication Array
- 3: – INTEGER arrayCommunication Array
- 4: – REAL (KIND=nag_wp) arrayCommunication Array
The arrays LWSAV
and RWSAV must not
be altered between calls to any of the routines E04NHA, E04NKA
- 5: – INTEGEROutput
: contains zero if a valid option string has been supplied and a
otherwise (see Section 6
6 Error Indicators and Warnings
The supplied option is invalid. Check that the keywords are neither ambiguous nor misspelt.
8 Parallelism and Performance
E04NHF/E04NHA is not threaded in any implementation.
may also be used to supply optional parameters to
See Section 10