NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG CL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07aa:  FL   CL   CPP   AD 

NAG CL Interface
x07aac (is_​finite)

NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG CL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07aa:  FL   CL   CPP   AD 

▸▿ Contents

© The Numerical Algorithms Group Ltd. 2019

1 Purpose

x07aac determines whether a floating-point number is finite.

2 Specification

#include <nag.h>
Nag_Boolean  x07aac (double x)
The function may be called by the names: x07aac, nag_ieee_is_finite or nag_is_finite.

3 Description

x07aac returns Nag_TRUE if and only if x is finite, 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

x07aac is not threaded in any implementation.

9 Further Comments

This function will return Nag_FALSE if the argument x is either infinite or a NaN (Not A Number).

10 Example

This program creates various infinities, NaNs and normal numbers and distinguishes between them.

10.1 Program Text

Program Text (x07aace.c)

10.2 Program Data

None.

10.3 Program Results

Program Results (x07aace.r)
NAG Library Manual, Mark 27
Interfaces:  FL   CL   CPP   AD 
NAG CL Interface Introduction
X07 (Ieee) Chapter Contents
X07 (Ieee) Chapter Introduction
x07aa:  FL   CL   CPP   AD 
© The Numerical Algorithms Group Ltd. 2019