X07ABF (PDF version)
X07 Chapter Contents
X07 Chapter Introduction
NAG Library Manual
NAG Library Routine Document
X07ABF
+
−
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
X07ABF determines whether a floating-point number is a NaN (Not A Number).
2 Specification
FUNCTION X07ABF (
X
)
LOGICAL X07ABF
REAL (KIND=nag_wp)
X
3 Description
X07ABF returns .TRUE. if and only if
X
is a NaN, and returns .FALSE. otherwise.
4 References
IEEE (2008)
Standard for Floating-Point Arithmetic
IEEE Standard 754-2008
IEEE, New York.
5 Parameters
1: X – REAL (KIND=nag_wp)
Input
On entry
: the number whose status is to be determined.
6 Error Indicators and Warnings
None.
7 Accuracy
Not applicable.
8 Further Comments
None.
9 Example
See
Section 9
in X07AAF.
X07ABF (PDF version)
X07 Chapter Contents
X07 Chapter Introduction
NAG Library Manual
© The Numerical Algorithms Group Ltd, Oxford, UK. 2012