To supply individual optional parameters to
E04NCF/E04NCA. More precisely, E04NEF must be used to supply optional parameters to
E04NCF and E04NEA must be used to supply optional parameters to
E04NCA.
E04NEA is a version of E04NEF that has additional parameters in order to make it safe for use in multithreaded applications (see
Section 5). The initialization routine
E04WBF must have been called before calling E04NEA.
E04NEF/E04NEA may be used to supply values for optional parameters to
E04NCF/E04NCA. It is only necessary to call E04NEF/E04NEA for those parameters whose values are to be different from their default values. One call to E04NEF/E04NEA sets one parameter value.
Each optional parameter is defined by a single character string,
of up to
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 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 E04NEF, 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 E04NEF ('Nolist')
suppresses printing of this and subsequent options. Printing will automatically be turned on again after a call to
E04NCF and may be turned on again at any time using the keyword
List.
For E04NEA 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
E04NCF/E04NCA 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
E04NCF/E04NCA.
A complete list of optional parameters, their abbreviations, synonyms and default values is given in
Section 12 in E04NCF/E04NCA.
None.
Not applicable.
Not applicable.
E04NDF/E04NDA may also be used to supply optional parameters to
E04NCF/E04NCA.