E04NUF may be used to supply individual real optional parameters to
E04NQF. The initialization routine
E04NPF must have been called before calling E04NUF.
E04NUF may be used to supply values for real optional parameters to
E04NQF. It is only necessary to call E04NUF for those parameters whose values are to be different from their default values. One call to E04NUF sets one parameter value.
Each real optional parameter is defined by a single character string in
STRING and the corresponding value in
RVALUE. For example the following illustrates how the
stability tolerance could be defined:
FACTOL = 100.0E0
IF (ILLCON) FACTOL = 5.0E0
CALL E04NUF ('LU Factor Tolerance', FACTOL, CW, IW, RW, IFAIL)
Optional parameter settings are preserved following a call to
E04NQF 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
E04NQF.
A complete list of optional parameters, their abbreviations, synonyms and default values is given in
Section 11 in E04NQF.
None.
If on entry
or
, explanatory error messages are output on the current error message unit (as defined by
X04AAF).
Not applicable.
E04NRF or
E04NSF may also be used to supply real optional parameters to
E04NQF.