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NAG Library Routine Document

x07bbf (create_nan)

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▸▿ Contents

© The Numerical Algorithms Group Ltd. 2018

1
Purpose

x07bbf creates a NaN (Not A Number).

2
Specification

Fortran Interface
Subroutine x07bbf ( quiet, x)
Integer, Intent (In):: quiet
Real (Kind=nag_wp), Intent (Out):: x
C Header Interface
#include <nagmk26.h>
void  x07bbf_ (const Integer *quiet, double *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
Arguments

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
Parallelism and Performance

x07bbf is not threaded in any implementation.

9
Further Comments

None.

10
Example

See Section 10 in x07aaf.
NAG Library Manual, Mark 26
NAG AD Library Manual, Mark 26
NAG C Library Manual, Mark 26
X07 (ieee) Chapter Contents
X07 (ieee) Chapter Introduction
© The Numerical Algorithms Group Ltd. 2018