NAG C Library Manual, Mark 26
NAG Library Manual, Mark 26
NAG AD Library Manual, Mark 26
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NAG C Library Function Document

nag_is_finite (x07aac)

NAG C Library Manual, Mark 26
NAG Library Manual, Mark 26
NAG AD Library Manual, Mark 26
x07 Chapter Contents
x07 Chapter Introduction

▸▿ Contents

© The Numerical Algorithms Group Ltd. 2018

1
Purpose

nag_is_finite (x07aac) determines whether a floating-point number is finite.

2
Specification

#include <nag.h>
#include <nagx07.h>
Nag_Boolean  nag_is_finite (double x)

3
Description

nag_is_finite (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 – doubleInput
On entry: the number whose status is to be determined.

6
Error Indicators and Warnings

None.

7
Accuracy

Not applicable.

8
Parallelism and Performance

nag_is_finite (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 C Library Manual, Mark 26
NAG Library Manual, Mark 26
NAG AD Library Manual, Mark 26
x07 Chapter Contents
x07 Chapter Introduction
© The Numerical Algorithms Group Ltd. 2018