To supply individual optional parameters to
E04USF/E04USA. More precisely, E04URF must be used to supply optional parameters to
E04USF and E04URA must be used to supply optional parameters to
E04USA.
E04URA is a version of E04URF 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 E04URA.
E04URF/E04URA may be used to supply values for optional parameters to
E04USF/E04USA. It is only necessary to call E04URF/E04URA for those parameters whose values are to be different from their default values. One call to E04URF/E04URA 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 E04URF, 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 E04URF ('Nolist')
suppresses printing of this and subsequent options. Printing will automatically be turned on again after a call to
E04USF and may be turned on again at any time using the keyword
List.
For E04URA 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
E04USF/E04USA 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
E04USF/E04USA.
A complete list of optional parameters, their abbreviations, synonyms and default values is given in
Section 11 in E04USF/E04USA.
None.
Not applicable.
E04UQF/E04UQA may also be used to supply optional parameters to
E04USF/E04USA.