NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG CL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07ab:  FL   CL   CPP   AD 

NAG CL Interface
x07abc (is_​nan)

NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG CL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07ab:  FL   CL   CPP   AD 

▸▿ Contents

© The Numerical Algorithms Group Ltd. 2019

1 Purpose

x07abc determines whether a floating-point number is a NaN (Not A Number).

2 Specification

#include <nag.h>
Nag_Boolean  x07abc (double x)
The function may be called by the names: x07abc, nag_ieee_is_nan or nag_is_nan.

3 Description

x07abc returns Nag_TRUE if and only if x is a NaN, and returns Nag_FALSE otherwise.

4 References

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

5 Arguments

1: x – double Input
On entry: the number whose status is to be determined.

6 Error Indicators and Warnings

None.

7 Accuracy

Not applicable.

8 Parallelism and Performance

x07abc is not threaded in any implementation.

9 Further Comments

None.

10 Example

See Section 10 in x07aac.
NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG CL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07ab:  FL   CL   CPP   AD 
© The Numerical Algorithms Group Ltd. 2019