X07BBF (PDF version)
X07 Chapter Contents
X07 Chapter Introduction
NAG Library Manual

NAG Library Routine Document

X07BBF

+− Contents

    1  Purpose
    2  Specification
    3  Description
    4  References
    5  Parameters
    6  Error Indicators and Warnings
    7  Accuracy
    8  Further Comments
    9  Example

1  Purpose

X07BBF creates a NaN (Not A Number).

2  Specification

SUBROUTINE X07BBF ( QUIET, X)
INTEGER  QUIET
REAL (KIND=nag_wp)  X

3  Description

X07BBF sets X to be a quiet or a signalling NaN (Not A Number).

4  References

IEEE (2008) Standard for Floating-Point Arithmetic IEEE Standard 754-2008 IEEE, New York.

5  Parameters

1:     QUIET – INTEGERInput
On entry: determines whether a quiet or a signalling NaN is to be created. If QUIET=1, the returned NaN is quiet, otherwise it is signalling. See reference IEEE (2008) for the distinction between the two kinds.
2:     X – REAL (KIND=nag_wp)Output
On exit: the required NaN value.

6  Error Indicators and Warnings

None.

7  Accuracy

Not applicable.

8  Further Comments

None.

9  Example

See Section 9 in X07AAF.
X07BBF (PDF version)
X07 Chapter Contents
X07 Chapter Introduction
NAG Library Manual
© The Numerical Algorithms Group Ltd, Oxford, UK. 2012