E05JHF (PDF version)
E05 Chapter Contents
E05 Chapter Introduction
NAG Library Manual

NAG Library Routine Document


Note:  before using this routine, please read the Users' Note for your implementation to check the interpretation of bold italicised terms and other implementation-dependent details.

+ Contents

    1  Purpose
    7  Accuracy
    9  Example

1  Purpose

E05JHF is used to check if you have set an optional parameter of E05JBF. The initialization routine E05JAF must have been called before calling E05JHF.

2  Specification


3  Description

E05JHF returns 1 if you have previously set the optional parameter contained in OPTSTR, otherwise it returns 0.
A complete list of optional parameters, their symbolic names and default values is given in Section 11 in E05JBF.

4  References


5  Parameters

1:     OPTSTR – CHARACTER(*)Input
On entry: a string identifying an optional parameter (as described in Section 11 in E05JBF).
2:     COMM(LCOMM) – REAL (KIND=nag_wp) arrayCommunication Array
On entry: communication data as initialized by E05JAF.
3:     LCOMM – INTEGERInput
On entry: the dimension of the array COMM as declared in the (sub)program from which E05JHF is called.
Constraint: LCOMM100.
4:     IFAIL – INTEGERInput/Output
On entry: IFAIL must be set to 0, -1​ or ​1. If you are unfamiliar with this parameter you should refer to Section 3.3 in the Essential Introduction for details.
For environments where it might be inappropriate to halt program execution when an error is detected, the value -1​ or ​1 is recommended. If the output of error messages is undesirable, then the value 1 is recommended. Otherwise, if you are not familiar with this parameter, the recommended value is 0. When the value -1​ or ​1 is used it is essential to test the value of IFAIL on exit.
On exit: IFAIL=0 unless the routine detects an error or a warning has been flagged (see Section 6).

6  Error Indicators and Warnings

If on entry IFAIL=0 or -1, explanatory error messages are output on the current error message unit (as defined by X04AAF).
Errors or warnings detected by the routine:
On entry,LCOMM<100,
orthe initialization routine E05JAF has not been called.
The optional parameter given in OPTSTR is invalid. A keyword or keyword combination was not recognized.

7  Accuracy

Not applicable.

8  Further Comments


9  Example

See Section 9 in E05JCF.

E05JHF (PDF version)
E05 Chapter Contents
E05 Chapter Introduction
NAG Library Manual

© The Numerical Algorithms Group Ltd, Oxford, UK. 2012