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 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 e04ura.

2 Specification

2.1 Specification for e04urf

Fortran Interface

Subroutine e04urf (

str)

Character (*), Intent (In)

str

C Header Interface

#include <nag.h>

void	e04urf_ (const char *str, const Charlen length_str)

2.2 Specification for e04ura

Fortran Interface

Subroutine e04ura (

str, lwsav, iwsav, rwsav, inform)

Integer, Intent (Inout)	::	iwsav(610)
Integer, Intent (Out)	::	inform
Real (Kind=nag_wp), Intent (Inout)	::	rwsav(475)
Logical, Intent (Inout)	::	lwsav(120)
Character (*), Intent (In)	::	str

C Header Interface

#include <nag.h>

void	e04ura_ (const char str, logical lwsav[], Integer iwsav[], double rwsav[], Integer inform, const Charlen length_str)

3 Description

e04urf/e04ura may be used to supply values for optional parameters to e04usf/e04usa. It is only necessary to call e04urf/e04ura for those arguments whose values are to be different from their default values. One call to e04urf/e04ura sets one argument value.

Each optional parameter is defined by a single character string, of up to

72

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 $40$ 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/e04ura ('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 12 in e04usf/e04usa.

4 References

None.

5 Arguments

1: $str$ – Character(*) Input: On entry: a single valid option string (as described in Section 3 and in Section 12 in e04usf/e04usa).; Note: the following are additional arguments for specific use with e04ura. Users of e04urf therefore need not read the remainder of this description.
2: $lwsav (120)$ – Logical array Communication Array
3: $iwsav (610)$ – Integer array Communication Array
4: $rwsav (475)$ – Real (Kind=nag_wp) array Communication Array: The arrays lwsav, iwsav and rwsav must not be altered between calls to any of the routines e04ura, e04uqa or e04ura.
5: $inform$ – Integer Output: On exit: contains zero if a valid option string has been supplied and a $value > 0$ otherwise (see Section 6).